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Chapter 6

Concept #2 Quiz

Concept #2 Quiz

Choose the best possible answer to the following questions about Key Concept 2 "Processes of mechanical weathering."

This activity contains 9 questions.

	Which are the four most important physical processes of mechanical weathering?   frost wedging, exfoliation, biological activity, dissolution frost wedging, unloading expansion, thermal expansion, biological activity exfoliation, thermal expansion, biological activity, hydrolysis exfoliation, frost wedging, expansion, hydrolysis

	Match the indicated feature with the most likely type of mechanical weathering. A matching question presents 4 answer choices and 4 items. The answer choices are lettered A through D. The items are numbered 2.1 through 2.4. Screen readers will read the answer choices first. Then each item will be presented along with a select menu for choosing an answer choice. Using the pull-down menus, match each item in the left column to the corresponding item in the right column. unloading biological activity frost wedging thermal expansion 2.1 talus [hint]  A B C D 2.2 exfoliation dome [hint]  A B C D 2.3 highway road cut [hint]  A B C D 2.4 shattered desert pebbles [hint]  A B C D

	Which physical process is dominated by “root wedging”?   mass wasting expansion biological activity frost wedging

	Which of the following best describes “frost wedging”?   A catastrophic breaking of rocks by the influx of water during hot periods of the day. A cyclic process by which water in fractures freezes at night, expanding the space between blocks of rock, followed by daytime ice melting. A gradual process by which roots from trees wedge rocks apart as they grow larger. Once the rocks break and fall, new roots form in new cracks. A momentary process by which water freezes inside the pore spaces in rocks, and explodes the rocks catastrophically.

	Which type of mechanical weathering process is associated with “peeling like an onion,” which is caused by ________?   root wedging – prying rocks apart by the action of roots in cracks frost wedging – influx of water into cracks inside rocks thermal expansion – the expansion of rocks due to extreme heating by day exfoliation – unloading of rocks in response to progressive removal of rock from above

	What is “talus” and which process of mechanical weathering is it most associated with?   The product of extreme breakdown of organic material after biological activity. The set of fractures in rocks produced by frost wedging. The pile of rock pieces fallen off steep slopes after frost wedging. The pattern of “onion-layer” fractures produced by “exfoliation.”

	Identify the indicated mechanical weathering process by selecting the correct response. A matching question presents 4 answer choices and 4 items. The answer choices are lettered A through D. The items are numbered 7.1 through 7.4. Screen readers will read the answer choices first. Then each item will be presented along with a select menu for choosing an answer choice. Using the pull-down menus, match each item in the left column to the corresponding item in the right column. overlying rock is eroded away the daily cycle of temperature weakens the rock activities of organisms, including plants, burrowing animals, and humans repeated cycles of freezing and thawing 7.1 frost wedging   A B C D 7.2 unloading   A B C D 7.3 thermal expansion   A B C D 7.4 biological activity   A B C D

	Which of the four important mechanical weathering processes is most important, and which is least important in producing sediment?   wind, water expansion, biological activity biological activity, exfoliation frost wedging, biological activity

	How does mechanical weathering aid chemical weathering?   Mechanical weathering increases surface area for chemical attack. Chemical weathering cannot proceed without the aid of mechanical weathering. Chemical weathering is controlled by the presence or absence of effective physical weathering. Mechanical weathering promotes the physical breakdown of rocks, thus producing chemical weathering.

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