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Chapter 8

Concept #5 Quiz

Concept #5 Quiz
Choose the best possible answer to the following questions about Key Concept 5 "Less obvious mass wasting: Creep and solifluction."

This activity contains 5 questions.

	Why do we have a false impression of the importance of a particular mass wasting process?   the immense volume of material wasted by catastrophic mass wasting is only surpassed by tsunami in destructive power the small volume of material wasted by catastrophic mass wasting is surpassed by erosion and deposition processes because of their large size and spectacular nature, but they are actually responsible for moving much less material than slower processes because of their small size and rather unimpressive nature, but they are responsible for moving smaller volumes of mass than slower processes

	Which of the following are visible effects of creep? Choose all that apply   retaining walls leaning downslope trees tilted downslope fences tilted downslope piles of rocks and debris downslope lack of vegetation lots of small gullies

	How do freezing, thawing, wetting and drying contribute to soil creep?   eventually, these cause the soil and regolith to suddenly slide down the slope causing much damage gravity exerts a much stronger force when the soil is wet and thawed, dropping it a slight distance downslope the soil becomes much weaker when dry and frozen, allowing it to flow downhill in small steps the soil expands and contracts, lifting particles and dropping them a slight distance downslope

	Match each label on the diagram illustrating "creep" with the process occurring there: For each item below, use the pull-down menu to select the letter that labels the correct part of the image. 4.1 weathering producing a soil and regolith mixture available for creep downslope A B C D 4.2 vegetation continually grows, but is being pulled downslope by creep of the soil A B C D 4.3 continual, gradual down-slope movement of soil and regolith A B C D 4.4 continual downslope-flow of the soil forces material to breach steep slopes A B C D

	When and where is “solifluction” common, and why?   rainy season in the tropics – the addition of water causes liquefaction which leads to solifluction summer in polar regions – the warmer temperature in summer causes some melting at the surface only causing a weakening there monsoon season in India – the very large volume of water greatly reduces the resistance of soils to flow downhill dry season in the grasslands south of the Sahara Desert – the absence of water prevents more flows, but induces solifluction at depth

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