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The crust varies in thickness, it is thinner under the oceans, thicker under the continents. The inner core and crust are solid; the outer core and mantle layers are plastic or semi-fluid. The core is composed of iron. The temperatures at the center of the core may be as high as 7500 K, hotter than the surface of the Sun...

The lower mantle is mostly silicon, magnesium and oxygen with some iron, calcium and aluminum. The upper mantle is mostly olivene and pyroxene, calcium and aluminum. Most of this is only from seismic techniques; samples from the upper mantle reach to the surface as lava from volcanoes but the majority of the Earth is unreacheable...

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