geologist:a scientist who studies earth.
magma:hot, molten rock deep below earth surface.
lava:magma that reach earth surface.
weathering:the breaking down of rocks into smaller pieces.
erosion:the picking up and carrying away of pieces of rock.
deposition:the dropping off of bits of eroded rock.
meteorite:a chunk of rock from space that strikes a surface(such as earth or the moon).
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