_____ particles cool at the top to form crust.. a) heavierb) lighter – InterviewSolution

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1.	_____ particles cool at the top to form crust.. a) heavierb) lighterc) thinnerd) closer
Answer» particles EXPLANATION:LIGHTER particles is the answer due to the fact that lighter particles have less density. As we KNOW mass is directly proportional to the density of the particles. Low mass causes them to move upward while heavier particles are settling down. These particles move to the top and form CRUST. These particles are easily cooled and form thin layer at the top.

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