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2
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solid layer of rock beneath the soil, soil is always being formed whenever it is exposed
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3
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soil made up of about equal parts of clay, sand, and silt; ideal for most plants
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4
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clay and other particles washed down from the A horizon, little humus; the B horizon
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6
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crumbly, dark brown soil that’s a mixture of humus, clay, and other minerals; the A horizon
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8
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organisms that break down dead organisms and digest them
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1
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O horizon, made up mostly of leaf litter and humus
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5
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the loose layer of dead plant leaves and stems on the surface of the soil
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7
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decayed matter in soil. It adds nutrients to soil it is located in the topsoil
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9
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the loose, weathered material on Earth’s surface in which plants can grow
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