the changing earth chapter fourteen: weathering and erosion 14.1 weathering 14.2 erosion 14.3 rivers...
TRANSCRIPT
![Page 1: The Changing Earth Chapter Fourteen: Weathering and Erosion 14.1 Weathering 14.2 Erosion 14.3 Rivers Shape the Land](https://reader035.vdocument.in/reader035/viewer/2022062217/56649e3b5503460f94b2d746/html5/thumbnails/1.jpg)
![Page 2: The Changing Earth Chapter Fourteen: Weathering and Erosion 14.1 Weathering 14.2 Erosion 14.3 Rivers Shape the Land](https://reader035.vdocument.in/reader035/viewer/2022062217/56649e3b5503460f94b2d746/html5/thumbnails/2.jpg)
The Changing Earth
![Page 3: The Changing Earth Chapter Fourteen: Weathering and Erosion 14.1 Weathering 14.2 Erosion 14.3 Rivers Shape the Land](https://reader035.vdocument.in/reader035/viewer/2022062217/56649e3b5503460f94b2d746/html5/thumbnails/3.jpg)
Chapter Fourteen: Weathering and Erosion
• 14.1 Weathering
• 14.2 Erosion
• 14.3 Rivers Shape the Land
![Page 4: The Changing Earth Chapter Fourteen: Weathering and Erosion 14.1 Weathering 14.2 Erosion 14.3 Rivers Shape the Land](https://reader035.vdocument.in/reader035/viewer/2022062217/56649e3b5503460f94b2d746/html5/thumbnails/4.jpg)
Investigation 14B
• How do people living and working in coastal areas affect erosion?
Human Impacts on Coastal Erosion
![Page 5: The Changing Earth Chapter Fourteen: Weathering and Erosion 14.1 Weathering 14.2 Erosion 14.3 Rivers Shape the Land](https://reader035.vdocument.in/reader035/viewer/2022062217/56649e3b5503460f94b2d746/html5/thumbnails/5.jpg)
14.2 Erosion
• Erosion is the process of moving pieces of rock and sediment by wind, water, ice, or gravity.
![Page 6: The Changing Earth Chapter Fourteen: Weathering and Erosion 14.1 Weathering 14.2 Erosion 14.3 Rivers Shape the Land](https://reader035.vdocument.in/reader035/viewer/2022062217/56649e3b5503460f94b2d746/html5/thumbnails/6.jpg)
14.2 Moving Sediment
• Weathering breaks rock into bits and pieces called sediment.
How does sediment get from a mountain peak to a beach?
![Page 7: The Changing Earth Chapter Fourteen: Weathering and Erosion 14.1 Weathering 14.2 Erosion 14.3 Rivers Shape the Land](https://reader035.vdocument.in/reader035/viewer/2022062217/56649e3b5503460f94b2d746/html5/thumbnails/7.jpg)
14.2 Moving Sediment• Weathering breaks rock into bits and
pieces called sediment.• Wind erodes mountains and moves
sediment, but not as well as flowing water.
![Page 8: The Changing Earth Chapter Fourteen: Weathering and Erosion 14.1 Weathering 14.2 Erosion 14.3 Rivers Shape the Land](https://reader035.vdocument.in/reader035/viewer/2022062217/56649e3b5503460f94b2d746/html5/thumbnails/8.jpg)
14.2 Running water moves sediment
• The process of depositing sediment after it has been moved by water, wind, or ice is called deposition.
• The amount of sediment carried and deposited by water depends on many factors:– the volume of water, – the slope of the land, and– how rocky or smooth the land is.
![Page 9: The Changing Earth Chapter Fourteen: Weathering and Erosion 14.1 Weathering 14.2 Erosion 14.3 Rivers Shape the Land](https://reader035.vdocument.in/reader035/viewer/2022062217/56649e3b5503460f94b2d746/html5/thumbnails/9.jpg)
14.2 Moving sediment
• A stream table can model how water flows over the land.
• The steeper the slope, the faster the water and sediment will move over land.
![Page 10: The Changing Earth Chapter Fourteen: Weathering and Erosion 14.1 Weathering 14.2 Erosion 14.3 Rivers Shape the Land](https://reader035.vdocument.in/reader035/viewer/2022062217/56649e3b5503460f94b2d746/html5/thumbnails/10.jpg)
14.2 Moving sediment
• A greater volume of water can move a lot of soil or sediment at once.
• Rocky landscapes can trap sediment so the sediment will not travel as far.
• A smooth river bed might mean sediment will be carried a long way.
![Page 11: The Changing Earth Chapter Fourteen: Weathering and Erosion 14.1 Weathering 14.2 Erosion 14.3 Rivers Shape the Land](https://reader035.vdocument.in/reader035/viewer/2022062217/56649e3b5503460f94b2d746/html5/thumbnails/11.jpg)
14.2 Sorting sediment• You can tell the speed of flowing water by the
size of the rock pieces found on a stream bottom.
• The grains settle in order, making a pattern called graded bedding.
![Page 12: The Changing Earth Chapter Fourteen: Weathering and Erosion 14.1 Weathering 14.2 Erosion 14.3 Rivers Shape the Land](https://reader035.vdocument.in/reader035/viewer/2022062217/56649e3b5503460f94b2d746/html5/thumbnails/12.jpg)
![Page 13: The Changing Earth Chapter Fourteen: Weathering and Erosion 14.1 Weathering 14.2 Erosion 14.3 Rivers Shape the Land](https://reader035.vdocument.in/reader035/viewer/2022062217/56649e3b5503460f94b2d746/html5/thumbnails/13.jpg)
14.2 Interpreting layers of sediment
• Sedimentary rocks hold clues to their past.
• If you know the up direction, you know the direction of younging—this is the direction of younger layers.
![Page 14: The Changing Earth Chapter Fourteen: Weathering and Erosion 14.1 Weathering 14.2 Erosion 14.3 Rivers Shape the Land](https://reader035.vdocument.in/reader035/viewer/2022062217/56649e3b5503460f94b2d746/html5/thumbnails/14.jpg)
14.2 Interpreting layers of sediment
• Cross bedding, is easy to recognize in sedimentary rocks where one layer ends and another layer passed over it.
![Page 15: The Changing Earth Chapter Fourteen: Weathering and Erosion 14.1 Weathering 14.2 Erosion 14.3 Rivers Shape the Land](https://reader035.vdocument.in/reader035/viewer/2022062217/56649e3b5503460f94b2d746/html5/thumbnails/15.jpg)
14.2 Moving sediment by ice• Particles that are
trapped in ice or suspended in water can cause weathering.
• As the ice of a glacier flows down a valley, it grinds the valley floor with pieces of rock caught up in the ice.
![Page 16: The Changing Earth Chapter Fourteen: Weathering and Erosion 14.1 Weathering 14.2 Erosion 14.3 Rivers Shape the Land](https://reader035.vdocument.in/reader035/viewer/2022062217/56649e3b5503460f94b2d746/html5/thumbnails/16.jpg)
14.2 Moving sediment by ice
![Page 17: The Changing Earth Chapter Fourteen: Weathering and Erosion 14.1 Weathering 14.2 Erosion 14.3 Rivers Shape the Land](https://reader035.vdocument.in/reader035/viewer/2022062217/56649e3b5503460f94b2d746/html5/thumbnails/17.jpg)
14.2 Moving sediment by ice
• As the ice of a glacier flows down a valley, it grinds the valley floor with pieces of rock caught up in the ice.
![Page 18: The Changing Earth Chapter Fourteen: Weathering and Erosion 14.1 Weathering 14.2 Erosion 14.3 Rivers Shape the Land](https://reader035.vdocument.in/reader035/viewer/2022062217/56649e3b5503460f94b2d746/html5/thumbnails/18.jpg)
14.2 Moving sediment by ice
• The fine rock powder that results from glaciers is called “rock flour.”
• Rock flour can be washed into lakes and make them a milky blue color.
![Page 19: The Changing Earth Chapter Fourteen: Weathering and Erosion 14.1 Weathering 14.2 Erosion 14.3 Rivers Shape the Land](https://reader035.vdocument.in/reader035/viewer/2022062217/56649e3b5503460f94b2d746/html5/thumbnails/19.jpg)
14.2 More on moving sediment
• Glaciers are formed from accumulation of snow over hundreds or thousands of years.
• As snow piles up and pressure increases, it changes into ice.
![Page 20: The Changing Earth Chapter Fourteen: Weathering and Erosion 14.1 Weathering 14.2 Erosion 14.3 Rivers Shape the Land](https://reader035.vdocument.in/reader035/viewer/2022062217/56649e3b5503460f94b2d746/html5/thumbnails/20.jpg)
14.2 More on moving sediment• Wind can move
particles of sediment from one place to another.
• Beach dunes hold large amounts of wind deposited sand.
• Loess is another wind-blown deposit of fine sediment.
![Page 21: The Changing Earth Chapter Fourteen: Weathering and Erosion 14.1 Weathering 14.2 Erosion 14.3 Rivers Shape the Land](https://reader035.vdocument.in/reader035/viewer/2022062217/56649e3b5503460f94b2d746/html5/thumbnails/21.jpg)
14.2 More on moving sediment
• Mass wasting is the downhill movement of large amounts of rock and sediment due to the force of gravity.
![Page 22: The Changing Earth Chapter Fourteen: Weathering and Erosion 14.1 Weathering 14.2 Erosion 14.3 Rivers Shape the Land](https://reader035.vdocument.in/reader035/viewer/2022062217/56649e3b5503460f94b2d746/html5/thumbnails/22.jpg)
14.2 More on moving sediment
• A landslide occurs when a large mass of soil or rock slides down a steep slope.
![Page 23: The Changing Earth Chapter Fourteen: Weathering and Erosion 14.1 Weathering 14.2 Erosion 14.3 Rivers Shape the Land](https://reader035.vdocument.in/reader035/viewer/2022062217/56649e3b5503460f94b2d746/html5/thumbnails/23.jpg)
![Page 24: The Changing Earth Chapter Fourteen: Weathering and Erosion 14.1 Weathering 14.2 Erosion 14.3 Rivers Shape the Land](https://reader035.vdocument.in/reader035/viewer/2022062217/56649e3b5503460f94b2d746/html5/thumbnails/24.jpg)
14.2 More on moving sediment
• Slumping describes what happens when loose soil becomes wet and slides or “slumps”.
• Slumping can happen after a period of very heavy rainfall.
![Page 25: The Changing Earth Chapter Fourteen: Weathering and Erosion 14.1 Weathering 14.2 Erosion 14.3 Rivers Shape the Land](https://reader035.vdocument.in/reader035/viewer/2022062217/56649e3b5503460f94b2d746/html5/thumbnails/25.jpg)
14.2 Erosion by people
• In the 1930s, the Great Plains of North America experienced serious wind erosion events.
What was this region’s knick-name?
![Page 26: The Changing Earth Chapter Fourteen: Weathering and Erosion 14.1 Weathering 14.2 Erosion 14.3 Rivers Shape the Land](https://reader035.vdocument.in/reader035/viewer/2022062217/56649e3b5503460f94b2d746/html5/thumbnails/26.jpg)
14.2 Erosion by people
• Farming practices that protect sediment and soil from erosion include installing windbreaks, planting ground cover, and using contour plowing for farming.