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Book 19, Question 116

What Is Frazil Ice?

Frazil ice is a river slush made of tiny ice crystals! On very cold nights, rushing water can cool slightly below freezing. Then crystals form all through the flow, like a slushy drink.

More fun facts

Sources: National Park Service, National Park Service

Questions kids ask

Where can you see frazil ice in Yosemite?

It is most famous below Lower Yosemite Fall, where waterfall mist freezes overnight.