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Chapter 8

Concept #1 Quiz

Concept #1 Quiz
Choose the best possible answer to the following questions about Key Concept 1 "'Mass wasting' and its role in landform development."

This activity contains 6 questions.

	Which of the following best describes “mass wasting”?   the downslope movement of rock, regolith and soil under the direct influence of gravity and wind the downslope movement of rock, regolith and soil under the direct influence of flowing water only the downslope movement of rock, regolith and soil under the direct influence of gravity only the downslope movement of rock, regolith and soil under the direct influence of gravity and flowing water and wind

	How is “mass wasting” different from “erosion”?   Mass wasting is strongly influenced by water and wind, whereas erosion is not. Mass wasting does not require gravity to force rocks downslope, whereas erosion does. Mass wasting does not require a transporting medium like water or wind, whereas erosion does. Mass wasting involves soil and sediment, whereas erosion does not.

	How does mass wasting connect the processes of weathering and erosion?   Mass wasting causes increased weathering and transports material to the ocean in streams or the like. Mass wasting transports material to a weathering site where erosion removes it downslope to the ocean. Mass wasting processes add material to the streams at the bottom of steep slopes so that erosion can add it to weathering sites. Mass wasting processes remove material from the weathering site and transport it to a stream or the like.

	Which of the following best describes how mass wasting MUST be involved in making stream valleys that are much wider than they are deep?   Mass wasting provides instability to the stream, causing it to erode its banks much more quickly and efficiently. The stream valley erodes the rocks beneath, making the slopes very stable, thus decreasing their susceptibility to rock falls. The stream valley erodes the rocks beneath, making the slopes very steep, thus increasing their susceptibility to rock falls. Mass wasting provides stability to the stream, causing it to deposit sediment at its banks much more quickly and efficiently.

	In which settings would devastating events of mass wasting be most rapid or massive, and why?   in areas where freeze-thaw and root-wedging can dislodge rocks, due to the large variation in temperature there in areas of smooth, old mountains, due to the shallow slopes there in areas of moderate terrain where young mountains have been deeply eroded, due to the large amounts of soil there in areas of rugged, young mountains, due to the steep slopes there

	What is the ultimate reason why mass wasting occurs in nature?   mass wasting provides an inefficient mechanism for transporting rocks and debris downslope mass wasting processes take stable situations and unstabilize them mass wasting provides an efficient mechanism for transporting sediment and soil to the oceans mass wasting processes take unstable situations and stabilize them

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