Clouds are an important part of the water cycle.

Meaning: Clouds play a significant role in the process of water moving from the earth to the atmosphere and back again.

Choice of Words: Important means very significant or valuable. Part means a piece or section of something. Water cycle is the process by which water moves from the earth to the atmosphere and back again. When you say "clouds are an important part of the water cycle," you are saying that clouds play a significant role in the process of water moving from the earth to the atmosphere and back again.

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