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Mystery #3Tier 2-3weather / air

Why do clouds float when they're full of water?

A big cloud can hold hundreds of tonnes of water, as much as a herd of elephants. Water is heavier than air, so by rights a cloud should crash straight down. Why does it just hang there instead?

Small fluffy white cumulus clouds scattered across a blue sky.
Photo: Aleda12 · CC BY-SA 4.0 · via Wikimedia Commons

Your guess

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