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 ...

This could take hundreds of years or be much quicker depending on how humans use resources. The mantle is a semi-solid layer below the crust. There are no elements in this part of the Earth's ...

Together, these layers protect us from the sun’s harmful radiation and keep temperatures on Earth habitable for all ... and over the last 40 years, the boundary between the troposphere and ...

What Was Happening on Earth at This Time The Precambrian is the earliest of the geologic ages, which are marked by different layers of sedimentary rock. Laid down over millions of years ...

Earth's interior is made up of a series of layers that sit below the surface crust. In order of depth, these layers include the solid, but flowing mantle, the liquid outer core and the solid iron ...