When molecules are exposed to heat, they A
stop moving completely.
B
begin to slow down.
C
start to move faster.
D
explode.

C

Explanation:

When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance. The end result of increased molecular motion is that the object expands and takes up more space.

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."

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