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Friday, February 25, 2011
Thursday, February 24, 2011
Erosion
For the past 2 weeks, we have been learning about weathering, erosion and deposition. Weathering is the process that breaks down rock and other material at Earth's surface. Erosion moves weathered material from one place to another. Deposition is the process where sediment is set down at a new location. (Go Team!)
Running water is the dominant process that shapes the landscape, including California's topography. We modeled erosion by rivers in class. Students were able to observe oxbow lakes, alluvial fans and deltas. Check out the pictures below.
We also talked about wave erosion, glacail erosion and mass movement. Waves hit the shore at an angle causing the sand to move down the coast. this process is called longshore drift. Features created from wave erosion include cliff, wave-cut platforms, cave, sea-stacks and sea-arches. Glaciers cause erosion as they move across the land. As they move, pieces of sediment get stuck in the ice and scrap along the ground. Scratches, called striations, are left behind. Deposits made by glaciers include till, moraines, and outwash. Gravity can also cause erosion (mass wasting). Most mass wasting happens quickly, like landslides, mudslides, rockfalls, and slump. Creep, on the other hand, happens very slowly but can still cause a great amount of damage. The amount of mass wasting that occurs depends on the type of climate...more rainfall and steep slopes means more mass wasting.
Running water is the dominant process that shapes the landscape, including California's topography. We modeled erosion by rivers in class. Students were able to observe oxbow lakes, alluvial fans and deltas. Check out the pictures below.
We also talked about wave erosion, glacail erosion and mass movement. Waves hit the shore at an angle causing the sand to move down the coast. this process is called longshore drift. Features created from wave erosion include cliff, wave-cut platforms, cave, sea-stacks and sea-arches. Glaciers cause erosion as they move across the land. As they move, pieces of sediment get stuck in the ice and scrap along the ground. Scratches, called striations, are left behind. Deposits made by glaciers include till, moraines, and outwash. Gravity can also cause erosion (mass wasting). Most mass wasting happens quickly, like landslides, mudslides, rockfalls, and slump. Creep, on the other hand, happens very slowly but can still cause a great amount of damage. The amount of mass wasting that occurs depends on the type of climate...more rainfall and steep slopes means more mass wasting.
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