Chapter 6 - Multiple-Choice Questions 1 Clay minerals...

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Multiple-Choice Questions 1) Clay minerals formed from gabbro or diorite bedrock illustrate which kind of weathering? A) chemical B) proactive C) syntropical D) mechanical Answer: A Diff: 1 2) Which of the following is/are most susceptible to chemical weathering by dissolution? A) quartz B) clay minerals C) iron oxides D) calcite Answer: D Diff: 1 3) Frost wedging is the major weathering process contributing to the formation of which regolith material? A) tropical laterites B) talus slopes C) C soil horizons D) mature pedalfers Answer: B Diff: 1 4) What portion of an angular, fracture-bounded granitic block shows the highest rate of weathering? A) the unfractured interior B) the edges and corners C) the crack surfaces not including edges and corners D) All of the above show equal rates. Answer: B Diff: 1 5) Which of the following describes a characteristic process in the formation of a pedalfer soil? A) soil bacteria produce organic acids that precipitate calcium carbonate in the B horizon B) iron oxides and aluminum-rich clays are precipitated in the B horizon C) humus accumulates below the solum in the C horizon D) clays are eluviated upward from the C horizon Answer: B Diff: 1
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6) Why is the humus layer typically thicker in a cool, temperate, forest soil than in a tropical rainforest soil? A) Less humus is produced in the tropical rainforest because the B horizon is so poorly developed. B) Less humus is produced in the cool, temperate forest but the rate of decay and oxidation is slower than in a tropical rainforest. C) More humus is produced in the tropical rainforest, but it is quickly washed away by the heavy rains. D) In a tropical rainforest, the forest-floor litter is often burned during the dry season. Answer: B d W F 7) Clay minerals, silica (Si02), and dissolved potassium bicarbonate in the soil water are products of which process? A) chemical weathering of olivine and plagioclase feldspar B) mechanical weathering of granite and rhyolite C) chemical weathering of orthoclase feldspar D) differential mechanical weathering of micas Answer: C Diff: 1 8) What two factors speed up rates of chemical reaction and weathering in rocks and soils? A) low temperatures; very dry B) low temperatures; very moist C) high temperatures; very dry D) warm temperatures; very moist Answer: D Diff: 1 9) In terrain with steep hill slopes, which crop and cultivation technique will minimize soil erosion? A) corn; rows trending straight down the slope, frequent cultivation B) apples; land between the trees is planted in grass and not cultivated C) winter wheat; after the harvest, the field is plowed and left idle until next fall D) bean, rows are spaced wider than on a level field Answer: B Diff: 2 10) In which area are pedocal soils most likely to be found? A) a tropical rainforest in the Amazon Basin of Brazil
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This note was uploaded on 07/16/2009 for the course GEOL 100 taught by Professor Johntrib during the Spring '09 term at Maastricht.

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Chapter 6 - Multiple-Choice Questions 1 Clay minerals...

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