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Understanding Mass Movement: Causes, Types, and Prevention

Discover the factors that cause sudden land movement and erosion on the Earth's surface, known as mass movement. Learn about different types of mass movement, their triggers, and how they shape landscapes. Explore preventative measures such as constructing fences, building walls, and putting up signs.

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Understanding Mass Movement: Causes, Types, and Prevention

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  1. AIM: What is Mass Movement? Do Now: What factors do you think cause the land to move suddenly or fall apart on the surface of the Earth (cause a mass movement).

  2. Mass Movement-the transfer of rock and soil down slope due to gravity *Mass Movements shape the landscapes on Earth

  3. Triggers (causes) of Mass Movement A) Water • Makes the soil/rock loose (over saturated)

  4. B) Oversteepend slopes • Material falls off steep slopes (people make the land too steep) C) Earth Quakes • dislodges or move large amounts of rock

  5. D) Removal of Vegetation • roots hold together the soil.

  6. II. Types of Mass Movement Classified by their speed and type of material that is moving A. Rockfalls • rock fragments move through the air Rock fall car B) Slides • movement of rock/material in contact with the surface. Japan landslide Landslides

  7. C) Slumps • slow downward movement of material causing a curved appearance.

  8. D) Mudflow • Move quickly • Occurs after/during heavy rains or rapid snow melt E) Earthflows • Move slowly • Occurs on hillsides in wet regions

  9. III. Preventing Mass Movement What do people do to prevent damage from mass movements? • construct fences • build walls • put up signs Rock fall fence(high energy)

  10. Closure: - Take a “Types of Mass Movement” worksheet from the back top bin. You have 10 minutes to complete both side and then we will go over the worksheet.

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