Weathering Topic 9 Regents Earth Science. Weathering The break down of rock material as a result of...
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![Page 1: Weathering Topic 9 Regents Earth Science. Weathering The break down of rock material as a result of chemical and/or physical action.](https://reader035.fdocuments.net/reader035/viewer/2022062518/56649eaa5503460f94baefd2/html5/thumbnails/1.jpg)
WeatheringWeathering
Topic 9
Regents Earth Science
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WeatheringWeathering
The break down of rock material as a result of chemical and/or physical action
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Physical weathering aka mechanical weatheringPhysical weathering aka mechanical weathering
The breakdown of rock into smaller pieces without chemical change
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1. Frost action1. Frost action
Weathering of rock by the alternate freezing and thawing of water in the pores or cracks in the rock
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Frost WedgingFrost Wedging
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2. Plant action2. Plant action
Occurs when cracks in rock are widened by the forces exerted by growing plants
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Plant ActionPlant Action
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3. Pressure unloading3. Pressure unloading
Occurs when rocks split along the planes of weakness when the pressure of overlying material is removed
Usually occurs as the result of natural processes such as landslides, erosion, and earthquakes
But humans also cause this through quarrying and mining
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4. Abrasion4. Abrasion
The physical action of scraping, rubbing, grinding, or wearing away of rock surfaces due to the movement of solid sediment in an erosional system such as stream or wind
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*As time increases, particles become more rounded.**As time increases, particles become more rounded.*
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5. Exfoliation5. Exfoliation
The scaling or peeling of successive shells from the surface of rocks
Generally occurs in coarse-grained rocks that contain feldspar (like granite)
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Pressure Unloading and ExfoliationPressure Unloading and Exfoliation
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Chemical weathering aka decopositionChemical weathering aka decopositionThe breakdown of rock by chemical
action, during which there is a change in chemical composition of the minerals in the rock
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The agents of chemical weathering includeThe agents of chemical weathering include
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1. oxygen1. oxygen
The chemical reaction of oxygen with another element is called oxidation
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2. water2. water
Speeds up chemical reactionsDissolves many materialsReacts directly with many mineral
substances (hydrolysis)
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Caves formCaves form
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3. Carbon dioxide3. Carbon dioxide
Easily dissolves in water to form carbonic acid
Calcite, limestone, and marble react with carbonic acid
Reaction of carbonic acid with other substances is known as carbonation
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SinkholeSinkhole
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4. acids4. acids
Produced in the atmosphere by lightning and on the surface by decay of organic wastes
Also gases released by people and industry combine with water to form acids
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