eq: how do humans add to the erosion process?
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EQ: How do humans add to the erosion process?. How do humans add to the erosion process ?. 1. What are natural and non natural ( human) agents of erosion ? 2. How can logging and mining lead to erosion? 3. How can farming lead to erosion 4. How can construction lead to erosion ?. - PowerPoint PPT PresentationTRANSCRIPT
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EQ: How do humans EQ: How do humans add to the erosion add to the erosion
process?process?
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How do humans add to the How do humans add to the erosion process ?erosion process ?
1. What are natural and non natural ( human) agents of erosion ?
2. How can logging and mining lead to erosion?
3. How can farming lead to erosion
4. How can construction lead to erosion ?
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Human Activity and ErosionHuman Activity and Erosion
Natural agents of erosion:– Wind– Moving water– Gravity (landslides)– Waves– Glaciers (rivers of ice)Humans add to the
erosion process:– Logging– Mining– Farming– Construction
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LoggingLogging• People use trees to build
homes, make furniture and paper.
• In a method called clear-cutting, all the trees in an area are cut down.
• Roots that used to hold the soil in place die and decay.
• Rain washes the soil away.• Soil has been robbed of
nutrients and minerals needed for plants to grow.
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MiningMining• To get minerals from the
ground, miners strip away the surface of the land.
• Strip-mining and open-pit mining remove plants from an area.
• Plants prevent soil erosion by flowing waters and wind.
• Without plants, erosion speeds up.
• Thousands of years may pass before enough topsoil builds up to support plant life.
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FarmingFarming• Planting crops can benefit many
people.• Planting crops and an
unexpected natural event can produce a disaster.
• From 1930 to 1937, a drought struck the mid-western part of the U.S.
• Grasses could have protected the soil during the drought.
• Winds picked up the topsoil and blew it 100s of miles eastward.
• This event is known as the “Dust Bowl.”
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ConstructionConstruction• Building of roads,
buildings, and communities removes natural barriers, such as plants, to erosion.
• Erosion speeds up and the land becomes barren and ugly.
• Today, city officials consider erosion when they plan new construction plans.
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Quick CheckQuick Check
• What is MAINLY responsible for preventing erosion?
A. mining
B. farming
C. rooting of plants
D. logging
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Quick CheckQuick Check
• Which human activity is related to logging?
A. strip mining
B. clear-cutting
C. drought
D. open-pit mining
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Quick CheckQuick Check
• A landslide is an example of
A. erosion
B. a mining process
C. A logging process
D. A farming process
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Quick CheckQuick Check
In what part of the United States was the “Dust Bowl” located?
• A. northern
• B. eastern
• C. western
• D. central
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Quick CheckQuick Check
What was the MAIN cause of the “Dust Bowl”?
A. floods
B. Storms
C. wind
D. drought