十万个为什么·科学阅读30篇（3）
15 / 30
正在确认阅读权限…
Why Does Ice Float on Water?
为什么冰能浮在水面上？
-
Most solids sink when placed in their own liquid.
-
But ice is different—it floats on liquid water.
-
When water freezes, its molecules form open hexagon shapes.
-
This makes ice less dense than cold water.
-
Less dense things rise above denser things.
-
So ice stays on top of lakes and rivers.
-
This keeps fish safe under the ice in winter.
-
It also helps Earth’s climate stay stable.