What’s winter about? Well, if you live in a place that gets cold enough, winter is about snow. Big, fat fluffy flakes that fall from the sky and pile up in freezing mounds.
Snow is frozen water, of course. But snowflakes aren’t tiny ice cubes. Instead, they are what happen when water vapor turns straight into ice. Scientists have successfully built snowflakes from scratch, like Elsa in Frozen (minus the magic, of course). But unlike Elsa’s skills, snow formation isn’t instant. The snowflakes build up as water molecules tumble around in the sky. Each flake usually takes between 15 minutes and an hour to form. Flakes also form best around a nucleus — a tiny speck of dust that the freezing water molecules can cling to.
Some places on Earth never get snow (though every U.S. state gets it at some point). But others are coated in ice year-round. These include the tops of mountains where glaciers — masses of ice that form when snow packs down over years — can be found. And then there’s Antarctica, where 97.6 percent of the continent is covered by snow and ice all year.
Earth is not the only planet with snow and ice. Saturn’s moon Enceladus is constantly covered in snow. And scientists think that melting snow might have formed the dry gullies that line the surface of Mars.
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How much water is in snow? Not nearly as much as you think. Pop some snow in a jar, bring it inside, and find out! All you need is a jar, some snow and a ruler.