Mixture of sawdusk and sand
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Answer. Most likely any sand you have will be denser than water, so it will sink, and the sawdust is going to be less dense than water, so it should float. mix it with a large amount of water, then scrape the sawdust off the top. Make sure you give the sand time to settle first though.
Explanation:
As the density of sand is more than saw dust, it settles down and saw dust floats on water. Sand can be separated by sedimentation and decantation. Saw dust can be separated by filtration.
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