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What causes the surface water to sink and form deep water in polar areas?

User Kwame
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Answer:ocean water gets very cold,forming sea ice as a consequence the surrounding seawater gets saltier,because when sea ice forms,the salt is left behind as the seawater gets saltier it's density increases and it starts to

Step-by-step explanation:

User Ilya Kochetov
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Answer: ...

Step-by-step explanation:

User Artur Nowak
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