How is lava formed in volcanoes?

Just to keep things straight, geologists use the word " magma " for molten rock that is still underground, and the word "lava" once it has erupted onto the surface. Rocks in the mantle and the core are still hot from the formation of the Earth about 4.6 billion years ago. When the Earth formed, material collided at high speeds. read more

Just to keep things straight, geologists use the word "magma" for molten rock that is still underground, and the word "lava" once it has erupted onto the surface. Rocks in the mantle and the core are still hot from the formation of the Earth about 4.6 billion years ago. When the Earth formed, material collided at high speeds. read more

As the temperature increases, the rocks begin to melt forming the fluid called magma. This magma when comes out on the surface of Earth through volcanoes is called Lava. The lava then solidifies as the temperature cools down forming extrusive igneous rocks and the process goes on. read more

Lava domes are formed from high viscosity basaltic lava which barely flows. This type of lava often creates a volcanic dome over and around its vent. When the dome hardens, it can trap gases, creating pressure. When the pressure is big enough, the dome is blown away to pieces in a violent eruption. read more