Science第 87 / 120 题
Which of these best explains why ice floats on water?
a.Ice is warmer than water.
b.Ice has more mass than water.
c.Ice is less dense than liquid water.
d.Ice contains more salt than water.
解析
Water expands as it freezes, so ice is less dense than liquid water and therefore floats. Density is mass per unit volume. This unusual property of water helps aquatic life survive under frozen surfaces.
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