Mass Wasting
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Questions and Answers

What is mass wasting?

  • The downward movement of rock, soil, and debris due to gravity (correct)
  • The upward movement of rocks and soil on a mountain slope
  • The horizontal movement of rocks and soil at the base of a mountain
  • The erosion caused by wind and rain on a mountain

Why does mass wasting occur?

  • Because of strong winds eroding the mountain
  • When gravitational forces overcome resistive forces holding the mountain together (correct)
  • Because of excessive vegetation on the mountain
  • Due to the growth of the mountain

How does slope steepness affect mass wasting?

  • It has no impact on mass wasting
  • It decreases the chances of mass wasting
  • It increases the likelihood of mass wasting (correct)
  • It causes rocks to flow uphill

What effect does excessive rainfall have on mass wasting?

<p>Weakens the mountain's ability to resist gravity (D)</p> Signup and view all the answers

How does mass wasting differ in different mountains?

<p>Some mountains have rocks falling like a fluid while others slide down in defined units (D)</p> Signup and view all the answers

What role does gravity play in mass wasting?

<p>Gravity overcomes resistive forces causing downward movement of materials (C)</p> Signup and view all the answers

Which factor makes a hillside more prone to mass wasting?

<p>Too much water weakening the hillside's resistance (A)</p> Signup and view all the answers

What happens to soil particles when there is too much rain or water on a mountain slope?

<p>They break apart and lose their bond. (C)</p> Signup and view all the answers

Why are mountain slopes with decreased vegetation more susceptible to mass wasting?

<p>They lack a protective plant covering above ground and anchoring roots below ground. (D)</p> Signup and view all the answers

What can cause sections of a mountain to detach due to violent shaking?

<p>Earthquakes (B)</p> Signup and view all the answers

Which type of mass wasting involves the sliding of coherent rock materials along a curved surface?

<p>Slump (D)</p> Signup and view all the answers

How is a rockslide different from a slump?

<p>A rockslide moves in a more uniform direction. (A)</p> Signup and view all the answers

What characterizes a debris flow?

<p>Movement of loose materials mixed with water down a slope like a fluid. (A)</p> Signup and view all the answers

What type of material typically develops an earthflow at the lower end of a slope?

<p>Clay, silt, and fine pyroclastic material (A)</p> Signup and view all the answers

What happens when earthflows combine with moisture?

<p>They ooze like an earthworm. (C)</p> Signup and view all the answers

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