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Weathering and Erosion

Tools

A	B
frost wedging	freezing water expansion
thermal expansion	expanding when heated
biological activity	tree roots splitting rocks
running water	powerful agent when armed with sand
wind	works like a sandblaster
rain	normal pH is 5.0
acid rain	lower than average pH
oxidation	rust or green copper
mechanical weathering	physical agents of erosion
chemical weathering	chemical agents of erosion

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