The composition of soil is best described as
A) approximately 45% organic matter, 50% mineral matter, and 5% water and air.
B) roughly 45% mineral matter, 5% organic matter, and 50% air and water.
C) pebbles, gravel, cobbles, and a varying combination of sands, silts, and clays.
D) the very thin surface layer rich in organic matter with some other mineral matter in the mix.
E) primarily mineral matter (approximately 72%), but also consists of organic matter (10%), and water (18%).
B
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