Question

what is refining?
$1)extraction \: of \: petralium \\ 2)separation \: of \: various \: fraction \: of \: pethrilium \\ 3)heatng \: of \: cool \: \: \\ 4)sedimentation \: of \: fissil \: fuels$
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Answer 1

Explanation:

option no 4 please mark as brilliant