Answer
Cold water is more dense than warm water, so when the ice melts at the top, the really cold water will want to sink to the bottom. This allows the warmer water to come up to the surface, while the melted ice sinks to the bottom.
Work Step by Step
Cold water is more dense than warm water, so when the ice melts at the top, the really cold water will want to sink to the bottom. This allows the warmer water to come up to the surface, while the melted ice sinks to the bottom.
