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Soils come in many types. They are all composed of small particles of mineral- and organic-based materials which have been broken down from rock sources and dead animals and plants. The variations in soil type depend on the types of rocks and the ratio of organic to mineral content. Breakdown from rock sources occurs via physical and chemical weathering processes. Breakdown from plant and animal sources is primarily via the action of insects, worms, and bacteria.

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Q: What is soil and how does it form?
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