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So what is a cloud, exactly?
Clouds Are Floating Water
Clouds are made of water. But they are not vapor, individual molecules of water flying around as a gas. Clouds are made of itsy-bitsy water droplets. Each droplet is made of many water molecules stuck together around a tiny speck of dust or salt. How small are cloud droplets? If you filled a shoebox with cloud, you would have more than 100 billion cloud drops.
Clouds Recycle
Where do clouds come from?
As the sun warms the earth, water evaporates from lakes, rivers, oceans, and the leaves of plants—and from you, when you get sweaty. When water evaporates, it makes vapor, individual molecules floating around.
Air carries the water vapor around.
