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The question doesn't say if the pond is stream fed. If it is groundwater fed - it will take much longer to freeze, due to the fact that the groundwater is moving through an insulated body (ground) and continually adds warm water to the system. This will most always be noticeable at an edge of the pond that never freezes over or takes much longer and colder ...


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Hate to break bad news, but we don't know. As oxygen is one of most abundant elements on earth by mass (not merely crustal), free protons or hydrogen atoms (as electrons are abundant) are more likely to be a limiting factor for water than oxygen by factor of 100:1. Of course, tracking hydrogen is downright difficult, as it just turns back into water under ...


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