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Why doesn't the water at the bottom of the ocean freeze?

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Firstly, let me give you a little basic knowledge about a property of liquids, then i'll proceed to the answer. As the temperature of a liquid/solid increases, its volume increases. Most liquids behave this way. But, water has a unique quality, a... read more

One reason that water doesn't freeze at the bottom of the ocean may be because it's salty down there. Cold water is more dense than warm water, so it makes sense that the coldest waters lie at the bottom of the oceans. In the same way, salty ocean water is more dense than pure water, and the saltiest ocean water sinks to the bottom of the ocean too. read more

Here’s why: The more salt in the water, the lower the temperature has to be for the water to freeze. This is why the ocean doesn’t freeze: There’s too much salt in it. Bodies of water located farther inland like islands and rivers have less salt in them, allowing them to freeze when the temperature drops to 0 degrees Celsius. read more

One reason ocean water doesn’t freeze all the way through is because it’s so salty! Salt lowers the freezing point of water, meaning that freshwater (without salt) will freeze sooner than salt-water; salt-water like the ocean has to get even colder than freshwater before it will freeze, and it doesn’t always necessarily reach that cold enough temperature. read more

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