200 pt
description
Transcript of 200 pt
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MechanicalWeathering
ChemicalWeathering
Rates of Weathering Soil Soil
Conservation
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Frost action where water seeps into cracks, freezes, and breaks
rock during cold weather
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Ice Wedging
![Page 4: 200 pt](https://reader036.fdocuments.in/reader036/viewer/2022081604/56816315550346895dd38e25/html5/thumbnails/4.jpg)
The part of plants that gets into cracks, grows, expands, and
breaks rock
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Roots
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The process when rocks and sand rub, scratch, and wear away other
rocks
![Page 7: 200 pt](https://reader036.fdocuments.in/reader036/viewer/2022081604/56816315550346895dd38e25/html5/thumbnails/7.jpg)
Abrasion
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Abrasion caused by rocks falling on other rocks
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Gravity
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True or False: Mechanical weathering changes the rock’s
composition
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False
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True or False: Over time, water can dissolve the minerals of
rocks.
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True
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A type of chemical weathering caused by polluted precipitation.
![Page 15: 200 pt](https://reader036.fdocuments.in/reader036/viewer/2022081604/56816315550346895dd38e25/html5/thumbnails/15.jpg)
Acid Rain
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These living things produce acids that break down rock over time.
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Lichens
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Chemical weathering that occurs when air reacts with iron in rocks
to create rust.
![Page 19: 200 pt](https://reader036.fdocuments.in/reader036/viewer/2022081604/56816315550346895dd38e25/html5/thumbnails/19.jpg)
Oxidation
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True or False: Wind abrasion is a form of chemical weathering.
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False
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True or False: Water can be both a mechanical & chemical
weathering agent.
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True
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The rate (or time it takes) for rocks to weather depends on
climate, elevation, and _______________ (what the rock
is made of).
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Composition
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Rocks in __________ climates will weather away faster because
they are exposed to more ice, wind, and precipitation.
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Colder/cooler/higher
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_____________ Weathering happens faster in warm, humid
climates
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Chemical
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True or False: The less rock that is exposed, the more it will
weather away.
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False
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Devil’s Tower (where the softer part of the volcano weathered away but left the harder rock
behind) is an example of __________ weathering.
![Page 33: 200 pt](https://reader036.fdocuments.in/reader036/viewer/2022081604/56816315550346895dd38e25/html5/thumbnails/33.jpg)
Differential
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The source (or beginning) of the soil is the __________ rock
![Page 35: 200 pt](https://reader036.fdocuments.in/reader036/viewer/2022081604/56816315550346895dd38e25/html5/thumbnails/35.jpg)
parent
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The dark soil found in Horizon A full of nutrients from decaying
plants and animals
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Humus
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This is found in Horizon R (bottom layer) and has not been
weathered at all
![Page 39: 200 pt](https://reader036.fdocuments.in/reader036/viewer/2022081604/56816315550346895dd38e25/html5/thumbnails/39.jpg)
Bedrock
![Page 40: 200 pt](https://reader036.fdocuments.in/reader036/viewer/2022081604/56816315550346895dd38e25/html5/thumbnails/40.jpg)
___________ occurs in Horizon E when water drains nutrients
down into this layer
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Leaching
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This type of soil sediment has the smallest grain size and water will
NOT move through it easily (Sand, Clay, or Silt)
![Page 43: 200 pt](https://reader036.fdocuments.in/reader036/viewer/2022081604/56816315550346895dd38e25/html5/thumbnails/43.jpg)
Clay
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True or False: Desert soil is best for growing crops
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False
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A conservation technique where old harvested plants are left to
lay on top of the soil
![Page 47: 200 pt](https://reader036.fdocuments.in/reader036/viewer/2022081604/56816315550346895dd38e25/html5/thumbnails/47.jpg)
No-till farming
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Planting rows of crops across the slope of a hill to hold create less
soil erosion
![Page 49: 200 pt](https://reader036.fdocuments.in/reader036/viewer/2022081604/56816315550346895dd38e25/html5/thumbnails/49.jpg)
Contour Plowing
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Planting crops in different fields each year so that nutrients have
time to be replenished
![Page 51: 200 pt](https://reader036.fdocuments.in/reader036/viewer/2022081604/56816315550346895dd38e25/html5/thumbnails/51.jpg)
Crop Rotation
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Why is soil worth protecting?
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We rely on soil to live!