Question

Water circulates through Earth's water cycle by changing its _____.

Answer 1

A would be your answer.

Answer 2

Water moved through the water cycle by changing its state. Think, for example, of water evaporating (liquid to gas), snow sublimating (solid to gas) or melting (solid to liquid), rain (gas to liquid), sleet (liquid to solid), or snow (gas to solid).

The answer would thus be A.