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Mystery #1Tier 2weather / water

Why does it rain?

Water falls out of the sky by the bucketload, yet the sky looks empty, and the water had to get up there somehow first. Where does all that rain come from, and what finally makes it fall?

Rain falling, beading on a surface.
Photo: Tima Ivanov · CC BY 3.0 · via Wikimedia Commons

Your guess

What's your hunch about how water gets up into the sky, and what makes it suddenly come back down as rain?

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