Question

Made of hot, solid rock, the mantle is beneath what layer of the earth?

Answer 1

crust

Beneath the crust is the mantle . The mantle is made of hot, solid rock. They know this because of seismic waves, meteorites, and the heat that comes from inside the planet. Mantle rock is mostly peridotite , which is rich in iron and magnesium   Figure below  . Peridotite is rare at Earth's surface.