how many layers does the earth have
The earth has four layers: the crust, mantle, inner core, and outer core. The lithosphere is the crust and the upper part of the mantle. The lithosphere is about 5 to 30 miles deep. The mantle is about 1800 miles thick. The outer core is about 1300 miles thick and the inner core is about 800 miles to the center of the earth. The inner core is a solid layer.