十万个为什么·科学启蒙30篇（3）

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温泉是怎么形成的

Last summer, we soaked our feet in warm spring water beside a forest trail.
That water started as rain, then sank deep underground where rocks heated it slowly.
It rose back up through cracks in the earth until it reached the surface again.
Some springs bubble up quietly, while others shoot steam into cool mountain air.
We felt the warmth even on chilly mornings, and the smell reminded us of boiled eggs.
Local guides told us how geothermal energy makes these pools naturally soothing.
Kids splash gently while adults lean back and close their eyes in comfort.
Park signs warn us not to jump in too fast, since some parts are much hotter.
The water cools as it flows downhill, making safe spots for wading and relaxing.
Now I always pack a towel and flip-flops whenever we plan a hot-spring day.