Question
Warm water generally gets more dense as it gets colder, and therefore sinks. This fact may lead you to believe that ice should form on the bottom of a lake first. But a funny thing happens to water as it ...
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Question
On its own, ice is not slippery. When you step onto an icy sidewalk, you do indeed feel a slippery surface. But the slipperiness is caused by a thin layer of liquid water and not directly by the solid ice ...
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