十万个为什么·科学启蒙30篇（3）
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The Ocean Tastes Salty When I Swim
我在海里游泳时海水是咸的
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Rainwater washes minerals like salt from rocks into rivers and then to the sea.
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Over millions of years, oceans collected huge amounts of dissolved salt from land.
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Salt stays in seawater because it doesn’t evaporate with the water vapor.
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Every liter of seawater holds about 35 grams of salt — mostly sodium chloride.
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Some places like the Dead Sea have even more salt because water evaporates faster there.
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Fish and seaweed live well in salty water thanks to special body adaptations.
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When you taste ocean water, your tongue senses salt before anything else.
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Desalination plants remove salt to make seawater safe for drinking and cooking.
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Ocean currents mix salty water so most areas taste similarly strong.
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You’ll feel thirsty after swallowing seawater because your body needs fresh water to balance the salt.