Flash Cards

7TH GRADE Rocks and weathering section 1 vocab

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

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