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Changing Earth’s Surface

Learn about the processes of erosion and mass movements that shape the Earth's surface. Discover the five major agents of erosion and how they transport sediments. Explore gravity-driven mass movements like slumps, creeps, rockslides, and mudflows, and their effects on the landscape. Understand how these processes contribute to the constant change of slopes.

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Changing Earth’s Surface

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  1. Changing Earth’s Surface Section 9.1

  2. Erosion Moving sediments from one place to another • 5 major agents • all carry sediments using energy of motion • all drop sediments when energy of motion decreases (deposition)

  3. 1) Gravity- mass movements • Slump – occurs on steep slopes when underlying material weakens - moves as one large mass - leaves a curved scar

  4. 1) Gravity- mass movements • Creep – very slow movement of sediment - caused by freezing and thawing

  5. 1) Gravity- mass movements • Rockslides – large rocks break off of steep slopes and tumble quickly to bottom - occurs in mountainous areas - most often after heavy rains

  6. 1) Gravity- mass movements • Mudflows – heavy rains mix with sediment and form a pasty substance which moves downhill - happens in relatively dry areas video video2

  7. The end result in all mass movements is that there is a constant change to a less steep slope.

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