Heating a substance causes molecules to speed up and spread slightly further apart, occupying a larger volume that results in a decrease in density. Cooling a substance causes molecules to slow down and get slightly closer together, occupying a smaller volume that results in an increase in density.
From: www.middleschoolchemistry.com
Answer:
Bacteria
Explanation:
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Stratovolcanoes, or composite volcanoes, mostly erupt dust, ash, and cinders.
