Layers of the earth!

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The earth has four different layers: the crust, mantle, inner core, and outer core. The lithosphere is the crust and the upper part of the mantle which are the two outter layers. The lithosphere is about 5 to 30 miles deep from the curst to the center. 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. Earthquakes start at the lithosphere. The crust is a thin rocky skin. The ocean floor is heavy, dense rock and the land is lighter, less dense rock. The upper part of the mantle is cooler than the deep mantle.