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Rocks and Weathering
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. |