what is the mantle made of
1 The mantle is made up of semi-molten rock called magma. 2  In the upper parts of the mantle the rock is hard, but lower down the rock is soft and beginning to melt. 3  The crust is the outer layer of the earth. 4  It is a thin layer between 0-60 km thick. 5  The crust is the solid rock layer upon which we live.