weathering, erosion, and deposition. weathering, erosion, and deposition changes the earth’s...
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![Page 1: Weathering, Erosion, and Deposition. Weathering, erosion, and deposition changes the Earth’s surface –Weathering-wears down the Earth’s surface –Erosion-moves](https://reader036.vdocuments.net/reader036/viewer/2022081421/56649f395503460f94c56361/html5/thumbnails/1.jpg)
Weathering, Erosion, and Weathering, Erosion, and DepositionDeposition
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• Weathering, erosion, and deposition changes the Earth’s surface
– Weathering-wears down the Earth’s surface
– Erosion-moves the Earth’s surface (acts as a bridge between the weathering and deposition)
– Deposition-builds up the earth’s surface
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WeatheringWeathering
• Processes at or near Earth’s surface that cause rocks and minerals to break down
– Mechanical – Processes that break a rock or mineral into smaller pieces without altering its composition
– Chemical – Chemically breaking down rock into new substances
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Types of MechanicalTypes of Mechanical
• Abrasion - grinding and wearing down of rock surfaces by other rock or sand particles, usually rounded. Happens by wind, water, and gravity
• Ice Wedging – Freezing and expansion of water within rock cracks.
• Exfoliation – Peeling back of rock layers
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Mechanical ContinuedMechanical Continued
• Biotic Weathering– Plants – Send roots into small cracks in rock,
the force of the growing roots cracks the rock even more, eventually breaking the rock down.
– Animals – Animals dig through the soil and move soil particles around, exposing fresh surfaces
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AbrasionAbrasionWind Abrasion
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Ice WedgingIce Wedging
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ExfoliationExfoliation
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Biotic Weathering Biotic Weathering
Plant Weathering
Animal Weathering
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Types of Chemical WeatheringTypes of Chemical Weathering
• Acid Rain – Precipitation containing acids because of pollution in the air
• Oxidation – Chemical reaction in which an element, such as iron, combines with oxygen to form an oxide. Copper Penny
• Acid in Ground Water – Some water contains weak acids which over long periods of time dissolve rock forming large caverns (not all caverns)
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Acid RainAcid Rain
The rock at Moon Valley has been worn away unevenly by decades of acid rain
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OxidationOxidation
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Acid in groundwaterAcid in groundwater
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ErosionErosion
• Erosion is simply movement down a slope due to gravity. We call it erosion if the rock particle is moved by some flowing agent such as air, water or ice.
• Erosion creates Valleys, Plateaus, Saddles
• So, here it is: if a particle is loosened, chemically or mechanically, but stays put, call it weathering. Once the particle starts moving, call it erosion.
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GlaciersGlaciers
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WaterWater
Galveston before and after IKE
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WindWind
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DepositionDeposition
• The process of eroded earth materials (sediments) being deposited in a new location
– Ex: delta-where sediment is deposited where a river flows into an ocean or lake builds up a landform
– Ex: sand dune-a deposit of wind blown sand
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Delta’sDelta’s
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Sand DunesSand Dunes