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6 Cards in this Set
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- Back
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4 types of weathering |
Physical, chemical, biological,mechanical weathering |
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What are the two main types of physical weathering |
Freeze-thaw - ( occurs when water continually seeps into cracks, freezes and expands, eventually breaking the rock apart.) exfoliation - ( occurs as cracks develop parallel to the land surface a consequence of the reduction in pressure during uplift and erosion.) |
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What are the difference types of weathering |
Solution - (removal of rock in solution by acidic rainwater. In particular, limestone is weathered by rainwater containing dissolved CO2, (this process is sometimes called carbonation). hydrolysis - (the breakdown of rock by acidic water to produce clay and soluble salts.) Oxidation - (the breakdown of rock by oxygen and water, often giving iron-rich rocks a rusty-colored weathered surface.) |
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What are the factors that affect the type, extent, and rate of weathering |
Climate - (chemical weathering is most active in areas with high temperature and rainfall.) rock type - (Thus, olivine which crystallizes first is the least resistant whereas; quartz which crystallizes last is the most resistant.) rock structure - (Highly jointed/fractured rocks disintegrate faster than a solid mass of rock of the same dimension.) topography - (On a gentle slope, water may stay longer in contact with the rocks, hence chemical weathering is enhanced.) time-length - (exposure to agents of weather determines the degree of weathering of a rock.) |
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Give the 3 living organisms that contribute to the biological weathering |
Tree , animal , bacteria |
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What is rock metamorphism |
In geology, this means any changes in mineral assemblage and texture of rocks which is a result of its interaction with various conditions such as pressures, temperatures, and chemical environments. |
