In a mixture of sand and water, sand being heavier settles down and clear water rises up. The layer of settled sand is called and the clear upper liquid is called .

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Detailed Solution

In a mixture of sand and water, sand being heavier settles down, and clear water rises. The layer of settled sand is called sediment, and the clear upper liquid is called supernatant.
An insoluble solid suspended in a liquid can be separated from that liquid by letting the insoluble solid settle down at the bottom, and this process is called sedimentation. The insoluble solid that settles down is known as sediment, and the clear liquid that comes up is known as supernatant. The supernatant can be poured out in a different container without disturbing the sediments, and this process is called decantation.

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