十万个为什么·科学阅读30篇（2）

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为什么山脉停止生长，尽管板块仍在持续运动？

Mountains form when tectonic plates collide and push Earth's crust upward over millions of years.
However, erosion by wind, water, and ice constantly wears them down at the same time.
Gravity also limits how high mountains can become before rock layers begin to collapse sideways.
Once uplift slows or stops, erosion gradually dominates and reduces their height over time.
The Himalayas are still rising because India’s plate pushes northward faster than erosion removes material.
But older ranges like the Appalachians have nearly stopped growing and now shrink slowly due to weathering.
Rock strength, climate, and regional stress all affect whether a mountain range grows or declines.
Scientists measure these changes using GPS satellites and laser elevation mapping over decades.
Even active mountains reach equilibrium when uplift balances erosion — a key concept in geomorphology.
This balance explains why Earth has no 20-kilometer-high peaks despite constant tectonic motion.

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

Scientists measure these changes using GPS satellites and laser elevation mapping over decades. 科学家通过GPS卫星和激光高程测绘，持续数十年监测这些变化。
This balance explains why Earth has no 20-kilometer-high peaks despite constant tectonic motion. 这种平衡解释了为何尽管地壳持续运动，地球却不存在高达20公里的山峰。
Once uplift slows or stops, erosion gradually dominates and reduces their height over time. 一旦抬升减缓或停止，侵蚀便逐渐占据主导，使山脉高度随时间降低。

这篇中文题目最接近哪一句？为什么山脉停止生长，尽管板块仍在持续运动？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？山脉由板块碰撞并持续数百万年向上推挤地壳而形成。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 Mountains Stop Growing Even Though Tectonic Plates Keep Moving? How to cook noodles A maths worksheet

Scientists measure these changes using GPS satellites and laser elevation mapping over decades.

Scientists measure these changes using GPS satellites and laser elevation mapping over decades.

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：Scientists measure these changes using GPS satellites and laser elevation mapping over decades.