A "caliche layer" in soil is
A) a hard layer formed by precipitation of calcium carbonate (CaCO3) .
B) a hard layer formed by precipitation of nitrates (KNO3, MgNO3) from over-fertilization.
C) a water-absorptive layer of peat.
D) a layer of younger soil overlaying an old, depleted soil.
E) a layer polluted with heavy metals.
Correct Answer:
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