Except for some kinds of foods,modern industry has made human dependence on soils a thing of the past.
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Q18: The layers of contrasting material found when
Q19: "Subsoil" is generally equivalent to which soil
Q20: In a typical mineral soil in optimal
Q21: If supplied with a suitable nutrient solution,plants
Q22: Soil horizons,like alluvial sediments,generally have a horizontal
Q24: The dark brown and black humus found
Q25: Although subsoil is more difficult to obtain,it
Q26: Subsoil is typically equivalent to the O
Q27: Plants can be grown without any soil.
Q28: Most of the water in our rivers
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