||The process that breaks down rocks on Earth's surface.
||Rocks are broken down by chemical changes.
||Rocks are physically broken apart.
||The movement of rock particles by wind,water, ice, or gravity.
||A material that is full of tiny, connected air spaces that allow liquid to flow through them.
||Sand and other rock particles that are carried by wind, water, or ice wear away exposed rock surfaces.
||Water seeps into cracks in rocks and freezes. Water expands when it freezes, and the expansion makes the rock crack, or fall apart.
||Plant like organisms that grow on rocks produce weak acids that chemically weather rock.