The mantle is the thick layer of hot, solid rock between the Earth's crust and the molten iron core. It makes up the bulk of the Earth, accounting for two-thirds of the planet's mass.The mantle starts about 30 kilometers down and is about 2900 kilometers thick.Let's take a look at six different aspects of the mantle.arth has the same recipe of elements as the Sun and the other planets (ignoring hydrogen and helium, which have escaped Earth's gravity). Subtracting the iron in the core, we can calculate that the mantle is a mix of magnesium, silicon, iron, and oxygen that roughly matches the composition of garnet.
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