process by which rock materials are broken down
breakdown of rock into smaller pieces by physcal means
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
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
slow growing roots crack cement
animals--worms earthworms ants mice
borrowing animals can cause mechanical weathering
process by which rocks break down as a result of chemical reactions
3 kinds of chemical weathering
water acid and air
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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