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? 3) Frost wedging is the major weathering process contributing to the formation of which regolith material? 4) What portion of an angular, fracture-bounded granitic block shows the highest rate of weathering? 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? 7) Clay minerals, silica (Si02), and dissolved potassium bicarbonate in the soil water are products of which process? 8) What two factors speed up rates of chemical reaction and weathering in rocks and soils? 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
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