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Chapter 8

Concept #4 Quiz

Concept #4 Quiz
Choose the best possible answer to the following questions about Key Concept 4 "Destructive mass wasting: Slumps, rockslides, debris flows, and earthflows."

This activity contains 9 questions.

	Identify each of the illustrated types of mass wasting by selecting the correct response. For each item below, use the pull-down menu to select the letter that labels the correct part of the image. 1.1 mudflow A B C D 1.2 slump A B C D 1.3 earthflow A B C D 1.4 rockslide A B C D

	Match each statement with its most likely form of mass wasting. For each item below, use the pull-down menu to select the letter that labels the correct part of the image. 2.1 a flowage of debris containing large amounts of water, common in semiarid regions A B C D 2.2 during times of heavy precipitation, water saturates the soil and regolith on a hillside, which then flows downward A B C D 2.3 material remains relatively coherent and moves along a well-defined surface A B C D 2.4 downward sliding of a unit of material on a curved surface A B C D

	Which of the following best describes the “slumping” style of mass wasting?   blocks of hard bedrock rapidly slide downhill along fracture surfaces a mass of soil or regolith becomes saturated with water and suddenly flows downhill to the base of the slope the soil and regolith move downhill very slowly a block or blocks of unconsolidated regolith slide downhill along a curved slip surface

	Which of the following is NOT a trigger of a slump?   a cliff oversteepened by wave action slopes oversteepened by a meandering stream when a slope is overloaded by saturated soil when a slope is overloaded by a house built on it a slope that is drained of water

	What is a rockslide?   when a volcano heats the snow on its slopes, causing ash to become dislodged when mud and debris combine and flow downhill as a viscous fluid when blocks of bedrock break loose and slide down a slope when blocks of coherent soil break loose and slide down a slope

	Which of the following is a NOT a trigger of a rockslide?   melting snow lubricates the underlying surface and weakens it the absence of available water due to surface runoff rain lubricates the underlying surface and weakens it earthquakes

	What is a “debris flow” and where is it commonly found?   an extremely fluid flow of rocks lubricated by an ice layer located just below the surface, common at the polar regions an extremely rapid flow of water-saturated rocks and soil, common on very gently-sloped regions of the midwestern USA a relatively slow flow of soil with a relatively small amount of water, common in very dry desert regions a relatively rapid flow of soil with a relatively large amount of water, common in semiarid mountainous regions

	Why do debris flows follow canyons and stream channels downhill unlike rockfalls, etc.?   because of their fluid properties because of their very large masses due to the lack of water or ice in the canyons and stream channels because of their very sticky (very viscous) properties

	Why do people develop towns on the top of old debris flows despite the danger?   People who live on old debris flows found it a beautiful place to live even though there are frequent flows which destroy local buildings. They get thrills from living in such impending danger. The debris fans are relatively easy to build on compared to the mountains – there is usually a long time between flows. The debris fans are relatively rugged and difficult to build upon, which means few people will be likely to build there.

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