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2014-07-08T20:39:39+08:00

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Filtration- a form of separating liquids and solids (such as sand and water) or separating solid to solid (gravel and sand)
sedimentation- tendency for small particles (like dust and small rocks) to settle at the bottom of a river "stick together" (to be compressed of some sort) and become a sedimentary rock (limestone, sanstone etc.)
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