Answer:Sedimentation occurs when the water in which the soil particles are carried is sufficiently slowed for a long enough period of time to allow particles to settle out. Heavier particles, such as gravel and sand, settle out sooner than do finer particles, such as clay. Soil consists of a mixture of weathered or eroded rocks, nutrients, living organisms, organic matter, water, and air. A soil in optimum condition contains approximately 45% solid material, 5% organic matter, and 50% pore spaces, which are occupied by an equal proportion of water and air
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