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Approximately what percentage of the P in surface soils is typically found in organic forms?
Q28: "Living" terraces involving rows of deep rooted
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Q37: Because of their greater surface area per
Q39: During the 1990s, the rate of increase
Q42: Evaporation from the soil surface (E) is
Q42: The belief in one's own capacity to
Q44: The transpiration ratio of a native meadow
Q45: Soils in which of the following soil
Q58: Piaget believed that in the process of
Q112: Abraham Maslow used the term _ to