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Mary and Ron are discussing the properties of water. Mary says that when water freezes, it becomes less dense than

Mary and Ron are discussing the properties of water. Mary says that when water freezes, it becomes less dense than liquid water. Ron says it becomes more dense. Who is correct and why?
a
Ron, because ice molecules are smaller than liquid water molecules
b
Ron, because ice sinks in liquid water
c
Mary, because ice molecules are larger than liquid water molecules
d
Mary, because lakes and ponds freeze at the bottom first

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