The Earth's crust is composed of a great variety of igneous, metamorphic, and sedimentary rocks. It is underlain by the mantle. The upper part of the mantle is composed of peridotite, a rock denser than rocks common in the overlying crust.
What Is The Definition Of The Earth's Crust?
An earth crust is the top most layer of the earth. The earth crust is made up of a great variety of igneous (shaped under great heat), metamorphic and sedimentary rocks.
It is the layer of rock that forms earth;s outer surface.