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26 April, 17:34

Which layer of soil is closest to the surface?

a. O (organic matter)

b. A (topsoil)

c. B (subsoil)

d. C (parent rock)

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  1. 26 April, 21:26
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    The layer of soil closest to the surface is letter a: O (organic matter). This is the top, organic layer of soil, mostly composed of unconsolidated mineral, dead leaves and humus - a decomposed organic matter - which functions as a natural avenue for growth of land plants.
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