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13 Cards in this Set
- Front
- Back
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weathering |
process that breaks down rock and other substances at Earth's surface |
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Erosion |
the transportation of sediment by wind, water, ice or gravity |
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uniformitarianism |
principle that states the same processes that operate today operated in the past |
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mechanical weathering |
type of weathering in which rock is physically broken into smaller pieces |
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abrasion |
refers to the grinding away of rock by rock particles carried by water, ice, wind or gravity |
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ice wedging |
process when wedges of ice in rocks widen and deepen cracks |
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chemical weathering |
process that breaks down rock through chemical changes |
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oxidation |
process in which iron combines with oxygen in the presence of water |
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permeable |
means that a material is full of tiny, connected air spaces that allow water to seep through it |
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What are the causes of chemical weathering? |
action of water, oxygen, carbon dioxide, living organisms and acid rain |
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What are the causes of mechanical weathering? |
freezing and thawing, release of pressure, plant growth, actions of animals and abrasion |
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How is topography reshaped? |
by weathering and erosion. These processes work together continuously to wear down and carry away rocks at Earth's surface |
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How does climate (rainfall) affect the rate of weathering? |
Both chemical and mechanical weathering occur faster in wet climates. |
