十万个为什么·科学启蒙30篇（3）

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大地震后会有巨浪涌来

Undersea earthquakes shift the ocean floor suddenly and push huge water columns upward.
This energy travels fast across deep water, forming long, low waves you can’t easily spot.
Near shore, the wave slows down but grows taller as water gets shallower.
Tsunamis aren’t like normal beach waves — they arrive as walls of churning water instead of curls.
Coastal warning systems use seismometers and ocean buoys to detect early signs of trouble.
People near beaches learn evacuation routes and meet at high ground when alarms sound.
Even small tsunamis can knock over cars or sweep away docks and fishing boats.
After a tsunami, volunteers help clean up broken homes and share clean water and food.
Some islands plant mangrove trees along shores because roots slow down incoming waves.
Always listen to local alerts — a tsunami may come minutes or hours after the first tremor.

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

Undersea earthquakes shift the ocean floor suddenly and push huge water columns upward. 海底地震会突然使海床位移，将巨大的水柱向上推。
Near shore, the wave slows down but grows taller as water gets shallower. 靠近海岸时，波浪速度减慢，但因水深变浅而变得更高。
Some islands plant mangrove trees along shores because roots slow down incoming waves. 一些岛屿在海岸沿线种植红树林，因其根系可减缓 incoming 波浪。

这篇中文题目最接近哪一句？大地震后会有巨浪涌来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？海底地震会突然使海床位移，将巨大的水柱向上推。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） Big Waves Can Rush In After Quakes How to cook noodles A maths worksheet

Undersea earthquakes shift the ocean floor suddenly and push huge water columns upward.

Undersea earthquakes shift the ocean floor suddenly and push huge water columns upward.

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：Undersea earthquakes shift the ocean floor suddenly and push huge water columns upward.