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 ...

Earth formed over 4.5 billion years ago from a swirling cloud ... Keep reading to learn more about Earth's different layers, its atmosphere, and what makes the "blue planet" unique.

Ask them what the shell pieces are referred to on the Earth. 4. Ask students what layer of the Earth is shown through the shell. 5. Now ask the students to squeeze their eggs gently until slight ...

The Earth is made up of different layers: Therefore, instead of tectonic plates moving because of the convection currents, evidence suggests it is the plates that drive the convection. Slab pull ...

The beginnings of a strange layer of molten rock deep inside the Earth may have finally been figured ... This colossal impact ...

At about 2.4 billion years ago ... The oxygen-rich ozone layer was also established, shielding the Earth's surface from harmful solar radiation. The first multicelled animals appeared in the ...