A sieve is used at construction sites to separate stones and pebbles from soil .justify

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The process of separating smaller particles from bigger ones by making them pass through a sieve is called sieving. It is used to separate stones and pebbles from the soil at a construction site. This is because stones and pebbles, being larger particles remain on the sieve while the fine soil particles pass through the holes of the sieve.

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I CAN'T UNDERSTAND THE QUESTION , PLEASE EXPLAIN THE QUESTION WELL , PLEASE .
 
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what to justify in this question ?
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