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Soil crust Soil crusts are soil surface layers that are distinct from the rest of the bulk soil, often hardened with a platy surface. Depending on the manner of formation, soil crusts can be biological or physical. Biological soil crusts are formed by communities of microorganisms that live on the soil surface whereas physical crusts are formed by physical impact such as that of raindrops. ==Biological soil crusts== (詳細はウィキペディア(Wikipedia)』 ■ウィキペディアで「Soil crust」の詳細全文を読む
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