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1 | |
The B-horizon of a soil |
| | A) | contains most of the organic matter in the soil |
| | B) | is where chemicals are deposited |
| | C) | is where leaching is most effective |
| | D) | all of the above |
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2 | |
Calcium carbonate (calcite) is deposited in the B-horizon of a |
| | A) | pedocal |
| | B) | pedalfer |
| | C) | laterite |
| | D) | peat |
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3 | |
Weathering is most intense in the |
| | A) | A-horizon |
| | B) | B-horizon |
| | C) | C-horizon |
| | D) | parent material beneath a soil |
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4 | |
Which of the following is always involved in chemical weathering? |
| | A) | oxygen |
| | B) | water |
| | C) | carbon dioxide |
| | D) | nitrogen |
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5 | |
Red color in soils results from |
| | A) | oxidation of iron |
| | B) | solution of calcite |
| | C) | hydrolysis of feldspar |
| | D) | solution of quartz |
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6 | |
Soil development (weathering) is slowest in |
| | A) | cool, dry climate |
| | B) | cool, humid climate |
| | C) | warm, humid climate |
| | D) | warm, dry climate |
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7 | |
Which is not a chemical weathering process? |
| | A) | oxidation |
| | B) | frost-shattering (-wedging) |
| | C) | solution |
| | D) | hydrolysis |
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8 | |
The rate of chemical weathering is affected by |
| | A) | temperature |
| | B) | soil moisture |
| | C) | soil grain size |
| | D) | all of the above |
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9 | |
Which of the following is removed by weathering from pedalfer soils but not from pedocal soils? |
| | A) | iron |
| | B) | calcium |
| | C) | aluminum |
| | D) | all are removed from both soils |
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10 | |
The chemical weathering process called solution |
| | A) | dissolves limestone and marble |
| | B) | involves carbon dioxide and water |
| | C) | involves carbonic acid |
| | D) | all of the above |
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11 | |
Laterite soils form in what climate? |
| | A) | humid, temperate |
| | B) | arid, semiarid |
| | C) | humid, tropical |
| | D) | polar |
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12 | |
Chemical weathering is fastest in |
| | A) | cool, dry climate |
| | B) | cool, humid climate |
| | C) | warm, humid climate |
| | D) | warm, dry climate |
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13 | |
The C-horizon of a soil is |
| | A) | the most completely weathered horizon |
| | B) | where chemicals are deposited |
| | C) | the horizon most similar to the parent material |
| | D) | the zone of leaching |
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14 | |
The B-horizon of a humid-climate soil is red because |
| | A) | clay minerals are deposited there |
| | B) | calcite is deposited there |
| | C) | iron oxide is deposited there |
| | D) | all of the above |
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15 | |
Soil is a nonrenewable resource because we are losing it faster than it forms. How long did it take to form the soils in the glaciated upper Midwest? |
| | A) | 1,000 years |
| | B) | 15,000 years |
| | C) | 100,000 years |
| | D) | 1,000,000 years |
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16 | |
Soil erosion is worst from land in which type of use? |
| | A) | forest |
| | B) | grazing |
| | C) | crops |
| | D) | construction |
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