Facts about Earth
Earth is the only place in the universe where life is absolutely known to exist.
Earthquakes, volcanic activity, mountain-building, and oceanic trench formation occur along plate boundaries.
The Earth is the only place in the universe known to support life, and its position, structure, and composition make it ideally suited for this purpose.
The gravitational attraction between the Earth and moon causes the tides on Earth.
The biosphere, which refers to that part of the outer shell in which life occurs, is usually not considered one of the physical layers of the Earth.
The mantle lies roughly between 30 and 2,900 km below the surface, and occupies about 70 percent of the Earth's volume.
The astrological and astronomical symbol for Earth consists of a circled cross, the arms of the cross representing a meridian and the equator (?).
Arguments used to support the latter view took into account some of the secondary effects of the Earth's shape and parallels with the shape of other planets.
The Earth's magnetosphere shields the surface by deflecting charged particles brought by the solar wind.
The Earth does not have a natural orbiting body other than the moon, although the asteroid Cruithne has been erroneously described as such.
The abundance of water on Earth is a unique feature that distinguishes our "blue planet" from others in the solar system.
The field forms the "Magnetosphere," which shields the Earth's surface by deflecting charged particles coming from the solar wind.
The most prominent features of the Earth's climate are its two large polar regions, two narrow temperate zones, and a wide, equatorial, tropical to subtropical region.
At the same time, the Earth's surface conditions have been significantly altered by the presence of life forms, which have created an ecological balance.
In ancient cultures, the Earth was often personified as a deity, particularly a goddess who, like a mother, gives birth to and nurtures life (see Gaea).
The most widely available isotope is polonium-210 (half-life 138.4 days), which emits alpha particles.
When viewed from outer space, much of the Earth has a deep blue and white appearance, caused by the oceans and clouds in the atmosphere.
Earth is the third planet in the solar system in terms of distance from the Sun, and the fifth in order of size.
Photographs taken by the Cassini-Huygens spacecraft on July 24, 2006, give strong evidence for the existence of methane or ethene lakes on Saturn's largest moon, Titan.
When considered in terms of its composition, the Earth consists of the following major layers: the atmosphere, hydrosphere, crust, mantle, and core.
The natural satellites orbiting other planets are also called moons, after the Earth's moon.
Climate models show that a steady increase in radiation reaching the Earth is likely to have dire consequences, including possible loss of the oceans.
Viewed from Earth's north pole, the motion of Earth, its moon, and their axial rotations are all counterclockwise.
Close to 40 percent of the Earth's land surface is presently used for cropland and pasture, or an estimated 3.3 Ч 109 acres of cropland and 8.4 Ч 109 acres of pastureland.
Once humans appeared, they transformed the Earth in a short time span like no other life form had before.
The Earth's day also lengthens by about 17 microseconds (µs) every year.
Paleontological evidence and computer simulations show that Earth's axial tilt is stabilized by tidal interactions with the moon.
Based on a phenomenon called tidal acceleration, the moon recedes from Earth at a rate of approximately 38 millimeters (mm) per year.
Today there is sufficient evidence to indicate that the Earth is an oblate spheroid—it bulges slightly at the equator and is slightly flattened at the poles.
The Earth's upper layer (lithosphere) is divided into several tectonic plates that gradually migrate across the surface over geologic time spans.
When the plasma (composed of charged particles) enters the Earth's atmosphere at the magnetic poles, it produces a phenomenon called the Aurora.
The Earth's mantle is the thick shell of rock that surrounds the outer core and lies directly beneath the thin crust.
Approximately 70.8 percent of the Earth is covered by water and only 29.2 percent is terra firma.
Terms that refer to the Earth may use the Latin root terra-, such as the word terrestrial, or the Latin root tellur-, as in telluric and tellurium.
By contrast, in ancient Egyptian mythology, Earth was symbolized as a male, Geb, and the sky was taken to be a female, Nut.
By that time, however, the Earth's orbit will expand to about 1.7 AU, due to mass loss by the Sun, and so the planet will escape envelopment.
Many places experience natural hazards such as hurricanes, earthquakes, landslides, tsunamis, volcanic eruptions, tornadoes, sinkholes, blizzards, floods, droughts, and other calamities.
The orbital and axial planes are not precisely aligned: Earth's axis is tilted some 23.5 degrees against the Earth-Sun plane.
Cruithne was discovered in 1986 and follows an elliptical orbit around the Sun at about the same average orbital radius as the Earth.
Historically, the disciplines devoted to depicting the Earth's surface have been cartography, the study and practice of mapmaking, and geography.
From Earth, this gives an apparent movement of the sun with respect to the stars at a rate of about one degree per day, that is, a sun or moon diameter every 12 hours, eastward.
The Earth's magnetic field is shaped roughly as a magnetic dipole, with the poles currently located proximate to the planet's geographic poles.
Earth is the largest of the "inner" planets of the solar system, that is, the planets between the Sun and the asteroid belt.
A photo of a distant Earth taken by Voyager 1 in 1990 inspired Carl Sagan to describe the planet as a "pale blue dot.
The idea of a flat Earth is more frequently treated tongue-in-cheek, or with mockery.
The same attraction has led to a phenomenon known as tidal locking: The moon's rotation about its own axis takes the same time as its orbit around the Earth.
The mass of the oceans is approximately 1.35 Ч 1018 tons, or about 1/4400 of the total mass of the Earth.
Scientists estimate that the Earth was formed around 4.57 billion (4.57Ч109) years ago.
The Earth's atmosphere protects and sustains life forms by absorbing ultraviolet solar radiation, moderating temperature extremes, transporting water vapor, and providing useful gases.
The presence of water and the chemical composition of the Earth's surface play significant roles in the development and sustenance of living organisms.
The Earth's orbital speed averages about 30 km/s (108,000 km/h), which is enough to cover one Earth diameter (~12,600 km) in seven minutes, and one distance to the moon (384,000 km) in four hours.
The diameter of the sun is about 400 times that of the moon, but the moon is 400 times closer to the Earth than the sun.
On the other hand, ancient Greek philosophers and other thinkers, including Thomas Aquinas (1225–1274), believed the Earth was spherical.
Consequently, the sun and moon appear roughly equal in size when viewed from the Earth.
According to current models, the Earth's destruction will take place in about 5 billion years (Gigayears, Gyr), when the Sun (as part of its solar lifespan) expands to a form called a Red Giant.
Only about 30 percent of the Earth's surface consists of dry land, while the remainder is covered with water.
Earth is the third planet in the solar system in terms of distance from the Sun, and the fifth in order of size.
Rocks tell us a great deal about the Earth's history. Igneous rocks tell of past volcanic episodes and can also be used to age-date certain periods in the past. Sedimentary rocks often record past depositional environments (e.g deep ocean, shallow shelf, fluvial) and usually contain the most fossils from past ages.May 28, 2016
The first igneous rocks on Earth (or to be exact - the proto-Earth) likely formed by impact melting of various small planetary bodies hitting each other and coalescing to form the Earth. These planetesimals formed by condensation of gas from the solar nebula, before Earth even existed, and before the rock cycle began.Mar 24, 2015
Here are some of the world's deadliest animals.Mosquitoes. AFP Mosquitoes are estimated to kill about 725,000 people every year. ... Snakes. Hunter Reptile Rescue The Inland Taipan snake is the world's most venomous, but not deadliest. ... Dogs. ... Crocodiles. ... Hippopotamus.
To enable life, this most special of attributes, planet Earth has a number of ideal features. It is unique among planets in our solar system for having water in its liquid form at the surface, in an amount conducive to life evolving.Jul 8, 2008
Earth Facts. Earth is the third planet from the Sun and is the largest of the terrestrial planets. The Earth is the only planet in our solar system not to be named after a Greek or Roman deity. The Earth was formed approximately 4.54 billion years ago and is the only known planet to support life.
Earth, our home planet, is the only planet in its solar system known to harbor life. All of the things we need to survive are provided under a thin layer of atmosphere that separates us from the uninhabitable void of space. Earth is made up of complex, interactive systems that are often unpredictable.
The Earth is thought to have been formed about 4.6 billion years ago by collisions in the giant disc-shaped cloud of material that also formed the Sun. Gravity slowly gathered this gas and dust together into clumps that became asteroids and small early planets called planetesimals.May 9, 2015
The answer is, we don't know. The name "Earth" is derived from both English and German words, 'eor(th)e/ertha' and 'erde', respectively, which mean ground. But, the handle's creator is unknown. One interesting fact about its name: Earth is the only planet that wasn't named after a Greek or Roman god or goddess.Nov 14, 2012
Geological timeline4.6 billion years agoThe origin of the Earth3.8 billion years agoFirst life arises2.1 billion years agoEukaryotes evolved1.1 billion years agoFirst sexually reproducing organisms570 million years agoFirst arthropods evolve15 more rows
The first living things on Earth, single-celled micro-organisms or microbes lacking a cell nucleus or cell membrane known as prokaryotes, seem to have first appeared on Earth almost four billion years ago, just a few hundred million years after the formation of the Earth itself.
How Long Have Humans Been On Earth? While our ancestors have been around for about six million years, the modern form of humans only evolved about 200,000 years ago. Civilization as we know it is only about 6,000 years old, and industrialization started in the earnest only in the 1800s.Jan 19, 2015
Many scientists think Earth has a maximum carrying capacity of 9 billion to 10 billion people. [How Do You Count 7 Billion People?]Oct 11, 2011
The mantle lies between Earth's dense, super-heated core and its thin outer layer, the crust. The mantle is about 2,900 kilometers (1,802 miles) thick, and makes up a whopping 84% of Earth's total volume. ... Other mantle elements include iron, aluminum, calcium, sodium, and potassium.Aug 11, 2015
Above the core is Earth's mantle, which is made up of rock containing silicon, iron, magnesium, aluminum, oxygen and other minerals. The rocky surface layer of Earth, called the crust, is made up of mostly oxygen, silicon, aluminum, iron, calcium, sodium, potassium and magnesium.
mantle definition. The region of the interior of the Earth between the core (on its inner surface) and the crust (on its outer). Note: The mantle is more than two thousand miles thick and accounts for more than three-quarters of the volume of the Earth.
Earth's mass is divided into an inner core, outer core, mantle, and crust. The crust is outermost layer of the earth, 3–44 miles (5–70 km) thick and representing less than 1% of the earth's total volume.
The Earth's interior is composed of four layers, three solid and one liquid—not magma but molten metal, nearly as hot as the surface of the sun. The deepest layer is a solid iron ball, about 1,500 miles (2,400 kilometers) in diameter. Although this inner core is white hot, the pressure is so high the iron cannot melt.
The incompatible elements that end up in the continents are important because they include the major radioactive elements uranium, thorium, and potassium. These create heat, which makes the continental crust act like an electric blanket on top of the mantle.
The thickest layer of the Earth. The Earth can be divided into four main layers: the solid crust on the outside, the mantle, the outer core and the inner core. Out of them, the mantle is the thickest layer, while the crust is the thinnest layer.Jan 13, 2016
The second is the Mantle and it is the thickest layer of earth's crust, it's divided into two parts but the mantle is made up into one. The third layer is the Outer Core and the Outer Core is made up by composed iron and liquid. The final layer is the Inner Core, it is the hottest and deepest part of the Earth.
As the mesosphere extends upward above the stratosphere, temperatures decrease. The coldest parts of our atmosphere are located in this layer and can reach –90°C. In the forth layer from Earth's surface, the thermosphere, the air is thin, meaning that there are far fewer air molecules.
A dinosaur the size of a Labrador retriever walked the Earth about 243 million years ago, suggesting the first reptiles were born much earlier than previously thought. Scientists who identified the newly identified species, Nyasasaurus parringtoni, believe it may have been the first dinosaur ever to have lived.Dec 5, 2012
The continents have since repeatedly collided and been torn apart, so maps of Earth in the distant past are quite different to today's. The history of life on Earth began about 3.8 billion years ago, initially with single-celled prokaryotic cells, such as bacteria.
Earth's first animal was the ocean-drifting comb jelly, not the simple sponge, according to a new find that has shocked scientists who didn't imagine the earliest critter could be so complex. The mystery of the first animal denizen of the planet can only be inferred from fossils and by studying related animals today.Apr 9, 2008
The churning metal of the outer core creates and sustains Earth's magnetic field. The hottest part of the core is actually the Bullen discontinuity, where temperatures reach 6,000° Celsius (10,800° Fahrenheit)—as hot as the surface of the sun. The inner core is a hot, dense ball of (mostly) iron.Aug 17, 2015
There are three main sources of heat in the deep earth: (1) heat from when the planet formed and accreted, which has not yet been lost; (2) frictional heating, caused by denser core material sinking to the center of the planet; and (3) heat from the decay of radioactive elements.
If the core were to cool completely, the planet would grow cold and dead. ... Cooling also could cost us the magnetic shield around the planet created by heat from the core. This shield protects Earth from cosmic radiation. The shield is created by a convection process caused by constantly moving iron.
A team of scientists has measured the melting point of iron at high precision in a laboratory, and then drew from that result to calculate the temperature at the boundary of Earth's inner and outer core — now estimated at 6,000 C (about 10,800 F). That's as hot as the surface of the sun.Apr 25, 2013
Spring (wet becoming hot) - Air - Aries, Taurus, Gemini. Summer (hot becoming dry) - Fire - Cancer, Leo, Virgo. Winter (cold becoming wet) - Earth - Libra, Scorpio, Sagittarius. Autumn (dry becoming cold) - Water - Capricorn, Aquarius, Pisces.
Tyrannosaurus rex, or T. rex for short, was a dinosaur that lived on Earth about 65 to 70 million years ago, during the Cretaceous period. T. rex is one of the largest carnivorous (meat-eating) dinosaurs ever discovered.
Tyrannosaurus rex lived in forested river valleys in North America during the late Cretaceous period. It became extinct about 65 million years ago in the Cretaceous-Tertiary mass extinction.Sep 10, 2010
Tyrannosaurus rex, or T. rex for short, was a dinosaur that lived on Earth about 65 to 70 million years ago, during the Cretaceous period. T. rex is one of the largest carnivorous (meat-eating) dinosaurs ever discovered.
The crust of the Earth is composed of a great variety of igneous, metamorphic, and sedimentary rocks. The crust is underlain by the mantle. The upper part of the mantle is composed mostly of peridotite, a rock denser than rocks common in the overlying crust.
The incompatible elements that end up in the continents are important because they include the major radioactive elements uranium, thorium, and potassium. These create heat, which makes the continental crust act like an electric blanket on top of the mantle.
Earth's crust is Earth's hard outer layer. It is less than 1% of Earth's volume. The crust is made up of different types of rocks: igneous, metamorphic, and sedimentary rocks. Below the crust is the mantle. The upper part of the mantle is made up of peridotite, a rock denser than rocks common in the crust.
As the mesosphere extends upward above the stratosphere, temperatures decrease. The coldest parts of our atmosphere are located in this layer and can reach –90°C. In the forth layer from Earth's surface, the thermosphere, the air is thin, meaning that there are far fewer air molecules.
Ozone is a gas in the atmosphere that protects everything living on the Earth from harmful ultraviolet (UV) rays from the Sun. Without the layer of ozone in the atmosphere, it would be very difficult for anything to survive on the surface.
Gravity is most accurately described by the general theory of relativity (proposed by Albert Einstein in 1915) which describes gravity not as a force, but as a consequence of the curvature of spacetime caused by the uneven distribution of mass.
Stars, exoplanets and deep-sky objects. Spica, also known as Alpha Virginis, is the brightest star in the constellation. Spica ranks as the 16th brightest star in the night sky and can be regarded as a nearly perfect example of a star of the first magnitude. It is a blue giant about 260 light-years from Earth.Jul 12, 2017
Earth Day is an annual event, celebrated on April 22, on which day events worldwide are held to demonstrate support for environmental protection. It was first celebrated in 1970, and is now coordinated globally by the Earth Day Network and celebrated in more than 193 countries each year.Sep 18, 2016
That's what Senator Gaylord Nelson of Wisconsin believed. He was disturbed that an issue as important as our environment was not addressed in politics or by the media, so he created the first Earth Day, on April 22, 1970. An estimated 20 million people nationwide attended festivities that day.
You're right that a "sidereal" day is about 23 hours, 56 minutes, 4 seconds. But this is not a day in the everyday sense. A sidereal day is how long it takes the earth (on average) to make one rotation relative to the faraway stars and other galaxies in the sky.Aug 26, 2012
The Hunger Project celebrates Earth Day on April 22, 2017. Earth Day is a call to action for the global community to address climate change, foster a sustainable, healthy environment and protect our planet for future generations. This year, the Earth Day theme is “Environmental and Climate Literacy.”Apr 13, 2017
Earth Day is an annual event celebrated on April 22. Worldwide, various events are held to demonstrate support for environmental protection. First celebrated in 1970, Earth Day events in more than 193 countries are now coordinated globally by the Earth Day Network.
Firstly, it is the only substance on Earth that is in liquid form at the temperatures commonly found on the Surface of our planet. Secondly, it is a superb solvent, meaning that other substances regularly and easily dissolve into it. This allows water to carry nutrients to cells, and carry waste away from them.
The mantle is a layer between the crust and the outer core. Earth's mantle is a silicate rocky shell with an average thickness of 2,886 kilometres (1,793 mi). The mantle makes up about 84% of Earth's volume.
Together with the crust, we call it the lithosphere. Below the lithosphere is a layer of upper mantle called the asthenosphere. This is made up rock that is fluid and can move. It is this fluidity that powers the movement of the tectonic plates of the Earth's crust.Oct 26, 2015
The mantle is the mostly-solid bulk of Earth's interior. The mantle lies between Earth's dense, super-heated core and its thin outer layer, the crust. The mantle is about 2,900 kilometers (1,802 miles) thick, and makes up a whopping 84% of Earth's total volume.Aug 11, 2015
The interior of Earth, similar to the other terrestrial planets, is chemically divided into layers. The mantle is a layer between the crust and the outer core. Earth's mantle is a silicate rocky shell with an average thickness of 2,886 kilometres (1,793 mi). The mantle makes up about 84% of Earth's volume.
Earth's inner mantle consists of hot, flowing rock that circulates extremely slowly, and is often explained by analogy to the flow in a lava lamp. But Jánosi found that there are some key differences. The wax in a lava lamp is more viscous than water, meaning it flows less easily.Sep 29, 2009
What Is the Function of the Earth's Core? The Earth's core comprises a solid inner core and liquid outer core, both made mostly of iron. ... Earth scientists have theorized that the Earth's core is responsible for the planet's magnetic field as well as plate tectonics.Apr 25, 2017
At the center of the Earth is the core, which has two parts. The solid, inner core of iron has a radius of about 760 miles (about 1,220 km), according to NASA. It is surrounded by a liquid, outer core composed of a nickel-iron alloy.Nov 14, 2017
— The spinning iron core in the center of the Earth would stop too. Without the spin, Earth's protective magnetic field would be gone too. The Sun radioactive rays would automatically kill anything left.Jun 16, 2014
If the Earth stopped spinning suddenly, the atmosphere would still be in motion with the Earth's original 1100 mile per hour rotation speed at the equator. ... This means rocks, topsoil, trees, buildings, your pet dog, and so on, would be swept away into the atmosphere.
The Moon has a diameter of 2,159 miles (3,476 kilometers) and is about one-quarter the size of Earth. The Moon weighs about 80 times less than Earth.
Perhaps the most important effect of the Moon is the way it stabilizes our rotation. When the Earth rotates it wobbles slightly back and forth on its axis. It's like a top, which doesn't simply spin in a vertical position on a table or the floor. But without the Moon we'd be wobbling much more.Jan 12, 2012
Watching the tides roll away. ... The tides are one of the most important ways that the Moon affects life on Earth. They are the result of the fact that the Moon's gravitational pull does not affect all parts of Earth equally: The lunar gravity exerts a stronger pull on the parts of Earth that are closer to the Moon.
A major purpose is to light up the night. The moon reflects the sun's light on to us even when the sun is on the other side of the earth. The amount of reflected light depends on the moon's surface area, so we are fortunate to have a moon that is so large. ... Another reason for the moon is to show the seasons.
The triplicities are water signs (Cancer, Scorpio, Pisces), fire signs (Aries, Leo, Sagittarius), air signs (Libra, Aquarius, Gemini) and earth signs (Capricorn, Taurus, Virgo). Each has the three Zodiac signs associated with that element.Oct 12, 2017
Seasonal snow is an important part of Earth's climate system. Snow cover helps regulate the temperature of the Earth's surface, and once that snow melts, the water helps fill rivers and reservoirs in many regions of the world, especially the western United States.
Plates at our planet's surface move because of the intense heat in the Earth's core that causes molten rock in the mantle layer to move. It moves in a pattern called a convection cell that forms when warm material rises, cools, and eventually sink down.May 21, 2008
Perhaps the most important effect of the Moon is the way it stabilizes our rotation. When the Earth rotates it wobbles slightly back and forth on its axis. It's like a top, which doesn't simply spin in a vertical position on a table or the floor. But without the Moon we'd be wobbling much more.Jan 12, 2012
The outer core of the Earth is a liquid layer about 2,260 km thick composed of iron and nickel which lies above the Earth's solid inner core and below its mantle. Its outer boundary lies approximately 2,890 km (1,800 mi) beneath the Earth's surface.
The earth is divided in to four layers:CRUST, MANTLE, OUTER CORE and INNER CORE. CRUST. Echo-sounding techniques are used to explore the Earth's crust. Images, similar to sonograms, are produced. A sonogram in the crust is called a seismic reflection.
According to current models, in addition to large amounts of iron, the Earth's liquid outer core contains small amounts of so-called light elements, possibly sulfur, oxygen, silicon, carbon, or hydrogen.Nov 23, 2011
What Is the Function of the Earth's Core? The Earth's core comprises a solid inner core and liquid outer core, both made mostly of iron. ... Earth scientists have theorized that the Earth's core is responsible for the planet's magnetic field as well as plate tectonics.Apr 25, 2017
The planet behaves in this way because it is responding to Earth's geomagnetic field. ... "The magnetic field pushes eastwards on the inner core, causing it to spin faster than the Earth, but it also pushes in the opposite direction in the liquid outer core, which creates a westward motion."Sep 16, 2013
They also estimate between 36 and 166 meteorites larger than 10 grams fall to Earth per million square kilometers per year. Over the whole surface area of Earth, that translates to 18,000 to 84,000 meteorites bigger than 10 grams per year.Jul 18, 2015
Worms help to increase the amount of air and water that gets into the soil. They break down organic matter, like leaves and grass into things that plants can use. When they eat, they leave behind castings that are a very valuable type of fertilizer. Earthworms are like free farm help.
In the Ragnarok story line he and all the Asgardians were briefly killed. While Thor will probably never die of old age it is possible for him to die in battle. In the Thor movie , Odin was about to die.Apr 4, 2012
The Orion Arm is a minor spiral arm of the Milky Way some 3,500 light-years (1,100 parsecs) across and approximately 10,000 light-years (3,100 parsecs) in length. The Solar System, including the Earth, lies within the Orion Arm.
The summer Milky Way will look brighter in the Northern Hemisphere. Most noticeably you should be able to see the Great Rift in good dark skies. This dark lane in between Cygnus and Scutum is where a string of dense interstellar clouds block the view of more distant stars.
Answer: Yes, you can see a few other galaxies without using a telescope! ... However, one of the most beautiful galaxies we can see with the naked eye is visible in the night sky all this month (November). The nearby Andromeda Galaxy, also called M31, is bright enough to be seen by the naked eye on dark, moonless nights.
The five brightest planets - Mercury, Venus, Mars, Jupiter and Saturn - have been known since ancient times and can easily be seen with the naked eye if one knows when and where to look. They are visible for much of the year, except for short periods of time when they are too close to the Sun to observe.
M31.html. The Andromeda Galaxy is the most distant object you can see with your naked eyes, two million light years away. It is visible as a dim, fuzzy star from a dark sky site. With binoculars you can clearly see the elliptical shape of the galaxy.
The Atlantic, Indian, and Pacific Ocean basins merge into icy waters around Antarctica. Some oceanographers define this as a fifth ocean, usually called the Antarctic or Southern Ocean basin. This video focuses on the Arctic Ocean basin and is taken from the interactive online game, My Ocean.Jan 23, 2013
Some of the planets in our solar system are much bigger than Earth while others are smaller. By using simple fractions, you will explore how their sizes compare to each other. Problem 1 - Saturn is 10 times bigger than Venus, and Venus is 1/4 the size of Neptune. ... Problem 3 - Earth is the same size as Venus.
In the case of bodies with substantial atmospheres, such as Earth's atmosphere, the exosphere is the uppermost layer, where the atmosphere thins out and merges with interplanetary space. It is located directly above the thermosphere.
240: The average distance in miles above Earth's surface the ISS orbits (400 kilometers). On a clear day, the ISS is easily visible to the naked eye from the ground.Aug 3, 2017
There are four fundamental interactions that we know of. These four interactions account for all observed forces. These interactions are: Strong Nuclear, Electromagnetic, Weak Nuclear and Gravitational. The strongest of these four is the Strong Nuclear.
When Earth formed 4.6 billion years ago from a hot mix of gases and solids, it had almost no atmosphere. The surface was molten. As Earth cooled, an atmosphere formed mainly from gases spewed from volcanoes. It included hydrogen sulfide, methane, and ten to 200 times as much carbon dioxide as today's atmosphere.
Oxygen is what is known as a highly reducing gas: it likes to combine with other molecules like atmospheric gases or surface rocks. ... Before the rise of photosynthesis, a process which produces oxygen and continues to this day to replenish our supply, Earth's atmosphere had no appreciable quantity of oxygen whatsoever.
Answer 1: Earth´s inner core and outer core are both made of an iron-nickel alloy. The state of matter (solid, liquid or gas) of a given material depends on its temperature and pressure. Most materials, including iron and nickel, change from liquid to solid at lower temperatures and/or higher pressures.
The outer core of the Earth is a fluid layer about 2,300 km (1,400 mi) thick and composed of mostly iron and nickel that lies above Earth's solid inner core and below its mantle. Its outer boundary lies 2,890 km (1,800 mi) beneath Earth's surface.
Above the inner core is the outer core, a shell of liquid iron. This layer is cooler but still very hot, perhaps 7,200 to 9,000 degrees Fahrenheit (4,000 to 5,000 degrees Celsius). It too is composed mostly of iron, plus substantial amounts of sulfur and nickel.
Earth Facts. Earth is the third planet from the Sun and is the largest of the terrestrial planets. The Earth is the only planet in our solar system not to be named after a Greek or Roman deity. The Earth was formed approximately 4.54 billion years ago and is the only known planet to support life.
Earth is our home planet. Scientists believe Earth and its moon formed around the same time as the rest of the solar system. They think that was about 4.5 billion years ago. Earth is the fifth-largest planet in the solar system.Oct 4, 2017
Earth, our home planet, is the only planet in its solar system known to harbor life. All of the things we need to survive are provided under a thin layer of atmosphere that separates us from the uninhabitable void of space. Earth is made up of complex, interactive systems that are often unpredictable.
All of the planets, except for Earth, were named after Greek and Roman gods and godesses. The name Earth is an English/German name which simply means the ground. It comes from the Old English words 'eor(th)e' and 'ertha'. In German it is 'erde'.
It takes 27 days, 7 hours, and 43 minutes for our Moon to complete one full orbit around Earth. This is called the sidereal month, and is measured by our Moon's position relative to distant “fixed” stars. However, it takes our Moon about 29.5 days to complete one cycle of phases (from new Moon to new Moon).
The name "Earth" is derived from both English and German words, 'eor(th)e/ertha' and 'erde', respectively, which mean ground. But, the handle's creator is unknown. One interesting fact about its name: Earth is the only planet that wasn't named after a Greek or Roman god or goddess.Nov 14, 2012
cheetah
During the formation of Earth, molten iron sank to its centre to make the core. This took with it the vast majority of the planet's precious metals -- such as gold and platinum. In fact, there are enough precious metals in the core to cover the entire surface of Earth with a four-metre thick layer.Sep 9, 2011