exam 4 summer 2009 - 1 Plants and animals can influence...

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1. Plants and animals can influence soil formation by adding organic matter to the soil when they die and by mixing the soil. This type of soil mixing is called: A) translocation. B) pedoturbation. C) fortification. D) aeration. Points Earned: 1.0/1.0 Correct Answer(s): B 2. In this class, you learned that the definition of soil can include the many different ways it functions in the environment. Which of the following is not one of these functions? A) Soil provides a medium for the growth of higher plants and a habitat for organisms. B) Soil recycles raw-material by decomposing organisms and biological material and storing/reusing it. C) Soil supports the anthropogenic ecosystem through its use as an engineering medium. D) Soil provides a medium for the formation of rare and precious gem stones, as well as other mineral resources. E) Soil controls the fate of water in the hydrologic system by regulating and purifying the water supply. Points Earned: 1.0/1.0 Correct Answer(s): D 3. Soil is about _______ pore space (where soil air and water are found) and ________ solid matter (where soil organic and mineral matter are found). A) 25%; 75% B) 40%; 60% C) 50%; 50% D) 75%; 25% Points Earned: 1.0/1.0 Correct Answer(s): C 4. Extensive farming is generally located in ___________ populated areas, while intensive farming can be located in ___________ populated areas.
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A) sparsely; densely B) densely; poorly C) heavily; more heavily D) heavily; moderately Points Earned: 1.0/1.0 Correct Answer(s): A 5. In general, soil erosion becomes a serious problem when: A) subsistence agriculture is practiced. B) mechanized agricultural methods are used. C) soils are heavily fertilized. D) erosion rates exceed the rate of soil formation. Points Earned: 1.0/1.0 Correct Answer(s): D 6. Prior to the Dust Bowl, soil erosion in the Great Plains was naturally controlled by: A) channels and ditches dug by Native Americans. B) prairie grasses/vegetation. C) natural windbreaks like aspen and poplar trees. D) the impact of the Rocky Mountains on weather systems. Points Earned: 1.0/1.0 Correct Answer(s): B 7. In your lesson, we discussed a few different ways to describe soils. Which of the following is not used to describe soils (according to the lesson)? A) soil components: air, water, organic matter, and mineral matter B) soil color C) soil texture D) soil odor E) soil horizons Points Earned: 1.0/1.0 Correct Answer(s): D
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8. Which of the following soil order descriptions is incorrect ? A) Alfisols: fertile, forest soils; found in the Midwest B) Ultisols: low fertility, forest soils; found in the southeast U.S. C) Mollisols: fertile, grassland soils; found in the Midwest and the Great Plains D) Aridisols: low fertility, volcanic soils; found in the Pacific Northwest and Hawaii E) Spodosols: coniferous-forest soils; found in cool, moist environments like the Great Lakes region and the northeast U.S. Points Earned:
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This note was uploaded on 09/14/2009 for the course ECON 340 taught by Professor Leidholm during the Summer '08 term at Michigan State University.

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exam 4 summer 2009 - 1 Plants and animals can influence...

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