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Why is the inner core solid?

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The inner core is solid because it is made of very dense, or heavy, materials - like iron and nickel. Even though it is very hot, these materials don't "melt" very easily, so they stay solid. Answer 3: It turns out that many materials can be a solid at a higher temperature if the pressure is also higher. read more

Question Date: 2001-10-15: Answer 1: The inner core is indeed hotter than the outer core. However, the PRESSURE on the inner core is greater than the pressure on the outer core and the melting point of iron, the main constituent of the core, INCREASES as the pressure goes up. read more

The layer outside the inner core is the outer core, with a thickness of approximately 1,430 miles. The outer core consists primarily of iron and nickel, two valuable metals found in abundant amounts on the planet. While these metals exist in solid form on the Earth’s surface, they create a molten alloy in the outer core. read more

The Earth's inner core is the Earth's innermost part. It is primarily a solid ball with a radius of about 1,220 kilometres, which is about 70% of the Moon's radius. It is composed of an iron–nickel alloy and some other elements. The temperature at the inner core's surface is approximately 5,700 K, which is about the temperature at the surface of the Sun. read more

I have never understood why earth's inner core is solid. Considering that the inner core is made of an iron-nickel alloy (melting point around 1350 C to 1600 C) and the temperature of the inner core is approximately 5430 C (about the temperature of the surface of the sun). read more

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