十万个为什么·科学启蒙30篇（1）

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为什么冰山能漂浮，而大部分冰却藏在水下？

Icebergs float because ice is less dense than liquid water.
When water freezes, its molecules form a loose crystal structure that takes up more space.
This makes ice about 9% lighter than the same volume of seawater.
So only about one-tenth of an iceberg shows above the surface.
The rest stays submerged due to buoyancy and the balance of forces.
Salt in seawater increases its density, helping icebergs stay afloat longer.
Melting icebergs don’t raise sea level much because they’re already displacing their weight.
Scientists use satellites to track iceberg size and movement carefully.
Understanding this helps us predict ocean current changes and climate impacts.
Even small temperature shifts can affect how fast icebergs break apart.

听 → 读 → 学表达 → 懂 → 今天会说这一句 → 跟读录音 → 自己说一句。

Icebergs float because ice is less dense than liquid water. 冰山能漂浮，是因为冰的密度小于液态水。
Scientists use satellites to track iceberg size and movement carefully. 科学家利用卫星严密追踪冰山的大小与移动。
So only about one-tenth of an iceberg shows above the surface. 因此，冰山只有约十分之一露出水面。

这篇中文题目最接近哪一句？为什么冰山能漂浮，而大部分冰却藏在水下？一次学校运动会的通知一份超市购物清单

课文第一句的意思更接近？冰山能漂浮，是因为冰的密度小于液态水。今天学校放假了。请把窗户打开。

这一课主要在讲什么？（看英文标题） Why Do Icebergs Float While Most of the Ice Is Hidden? How to cook noodles A maths worksheet

Icebergs float because ice is less dense than liquid water.

Icebergs float because ice is less dense than liquid water.

第一版：录下来、回听、再听标准音。系统打分以后再加。

用今天的表达，自己说一句。

例子：Icebergs float because ice is less dense than liquid water.