十万个为什么·科学启蒙30篇（3）
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Hot Water Rises Up from Deep Underground
温泉是怎么形成的
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Last summer, we soaked our feet in warm spring water beside a forest trail.
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That water started as rain, then sank deep underground where rocks heated it slowly.
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It rose back up through cracks in the earth until it reached the surface again.
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Some springs bubble up quietly, while others shoot steam into cool mountain air.
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We felt the warmth even on chilly mornings, and the smell reminded us of boiled eggs.
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Local guides told us how geothermal energy makes these pools naturally soothing.
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Kids splash gently while adults lean back and close their eyes in comfort.
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Park signs warn us not to jump in too fast, since some parts are much hotter.
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The water cools as it flows downhill, making safe spots for wading and relaxing.
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Now I always pack a towel and flip-flops whenever we plan a hot-spring day.