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The earth consists of several different and distinct layers. The three main layers are the core, the mantle and the crust. The core is the inner part of the earth, the crust is the outer part and between them is the mantle. Knowledge of earth's interior is essential for understanding plate tectonics. The Earth is made of many layers. The deeper layers are composed of heavier materials; they are hotter, denser and under much greater pressure than the outer layers. The Earth's surface is composed mostly of water, basalt and granite. Oceans cover about 70% of Earth's surface. These oceans are up to 3.7 km deep.

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12y ago

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