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mass movement the downhill movement of rock and soil because of gravity magma molten rock inside the earth’s surface (lava is molten rock OUTSIDE the earth’s surface) core earth’s hottest layer; the center layer of the earth weathering the process of breaking rock into soil, sand, or other tiny pieces called sediment earthquake a shaking of the ground caused by a sudden release of earth’s energy mantle the layer beneath the crust filled with molten rock deposition the process of dropping or depositing sediment in a new location continental drift the theory of how Earth’s continents move over it’s surface erosion the process of moving sediment from one place to another Pangea According to theory, this was the “supercontinent” that contained all of Earth’s land about 225 million years ago plate a rigid block of crust fossils The remains or traces and upper mantle of past life found in the Earth’s crust crust The outer layer of earth made of rock, we stand on this landform a physical feature of the Earth’s surface fault a place where pieces of Earth’s crust move, often earthquakes occur here volcano an opening in Earth’s crust through which lava flows