Soil is composed of 70% mineral matter, 5% organic matter, and varying amounts of water and air totaling 25%.
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Q86: Rounded peds have more pore space between
Q87: In addition to designation of horizons, soil
Q88: Soil oxygen concentrations are lower than atmospheric
Q89: All organisms living in, on, and over
Q90: Biological activity by plant roots or tunnelling
Q92: Soil texture is probably the most permanent
Q93: Steep slopes tend to develop thicker soils
Q94: In the Northern Hemisphere, north facing slopes
Q95: A dark colored soil always indicates high
Q96: The A horizon is also commonly called
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