Pebbles can be removed from sand by _____________.

sieving

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decantation

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sublimation

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sedimentation

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Solution

The correct option is A sieving
Sieving is used to separate a solid-solid mixture whose components differ in size. To carry out sieving, a sieve is used which is a type of net. This net does not allow particles larger than the pore size to pass through. Thus, pebbles and sand can be separated by sieving.

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Question 20

Given below is a jumbled sequence of the processes involved in a wastewater treatment plant. Arrange them in their correct sequence.
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