A fault line is a fracture in the Earth’s crust where two blocks of the Earth’s lithosphere move past each other. The block on the top is called the crust and the block on the bottom is called the mantle. The lithosphere is the solid outer layer that makes up the Earth. The lithosphere is broken into tectonic plates. The Earth’s plates move on the Earth’s mantle. The mantle is the layer of the Earth that is made up of …
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