| Question 1: The development and distribution of color in a soil profile result from chemical and biological weathering, especially ________ reactions. | |||
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| Question 2: The ________ originates primarily from water erosion (gully erosion) in the Loess Plateau region of northwest China. | |||
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| Question 3: High soil tannin (________) content from plants can cause nitrogen to be sequestered by proteins or cause nitrogen immobilization, also making nitrogen unavailable to plants. | |||
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Question 4: Which of the following titles did Soil have?
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| Question 5: Soil salination is the accumulation of free ________ to such an extent that it leads to degradation of soils and vegetation. | |||
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| Question 6: The electrical resistivity of soil can affect the rate of ________ of metallic structures in contact with the soil. | |||
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| Question 7: The naming of ________ is based on the type of material the horizons are composed of; these materials reflect the duration of the specific processes used in soil formation. | |||
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| Question 8: ________ is an environmental process of ecosystem degradation in arid and semi-arid regions, often caused by human activity. | |||
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| Question 9: Many soil colors are due to the extensive and various ________ minerals. | |||
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| Question 10: Clay particles also absorb ________ that would break down proteins. | |||
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