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process by which rock materials are broken down

mechanical weathering

breakdown of rock into smaller pieces by physcal means

ice wedging

starts when water seeps into cracks during warm weather.When water freezes and expands it pushes against the rack and causes the crack to widen

frost action

alternatin freexing and thawing of soil and rock


the grinding and wearing away of rock surfaces through the mechanical action of other rock or sand particles

3 forms of abrasion

wind, water and gravity

powerful plants

slow growing roots crack cement

animals--worms earthworms ants mice

borrowing animals can cause mechanical weathering

chemical weathering

process by which rocks break down as a result of chemical reactions

3 kinds of chemical weathering

water acid and air

acid precipitation

rain sleeet or snow that contains a high concentration of acids

3 kinds of acid precipitaion

rain sleet snow

acid in ground water

carbonic or sulfuric acid react with rocks in the ground and cause a chemical reaction dissolbing the rock

acid in living things

linchen consist of fungi & algae living together contribute to chemical weathering


oxygen/air reactsmetals such as iron,causing rust, therefore causing chemical weathering


is a chemical reaction in which an element such as iron combines with oxygen to form an oxide

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