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Polynya holes, also known as marine polynyas, are areas of open water that form in the middle of an ocean or other large body of water. They can form when a large mass of freshwater flows into an ocean, or when a body of salt water becomes saturated with freshwater.
Polynyas can play an important role in the marine environment, providing a source of food for marine animals, and helping to regulate ocean temperature. They can also be a source of oxygen for marine life, and can protect ships and other boats from storms.
Polynyas can be quite rare, and are often only found in certain parts of the world. They are also susceptible to changes in the environment, and can disappear if the conditions that led to their formation are no longer present.