Crust
The Earth's very first layer is the crust which is made up of granite and basalt. It is about 70 miles thick in some mountain ranges, about 25 miles thick beneath continents, and about 6.5 miles thick beneath oceans. The crust is light and brittle, and most earthquakes occur within the crust. Underneath the continents the crust is almost three times as thick, as it is under oceans.The crust is 35 degrees c.