depends how cold and what you use to freeze it
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It all depends on the temperature of the air that it is in contact with, the air has to be at least 0 degrees Celsius so you cannot work out how quickly it will freeze without knowing the air temperature ;)
If it was tap water that filled it, no more than two days, as the chlorine in tap water may be ineffective after a day. A swimming pool can turn green from algae in a day.
An aquarium is 10 ft long, 3 ft wide, and is filled with water to a depth of 7 ft. Water weighs 62.4 pounds per cubic foot. What is the volume and weight of the water in the tank
What is "a long passage of water" called
They believe that it is from water flow.