好奇为什么 · 4-8 岁

海水为什么是咸的

矿物离子的漫长旅行

科普启蒙约 5 分钟4-8 岁中英双语

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海边的风吹来一小滴浪花，小树抿抿嘴：“咦，是咸的！这么大一片海，里面的咸味从哪里来呢？”

A tiny drop of sea spray blew onto Xiaoshu's lips. He smacked them thoughtfully. “Oh, it’s salty! Where does all the saltiness in this enormous sea come from?”

海边的风吹来一小滴浪花，小树抿抿嘴：“咦，是咸的！这么大一片海，里面的咸味从哪里来呢？”

A tiny drop of sea spray blew onto Xiaoshu's lips. He smacked them thoughtfully. “Oh, it’s salty! Where does all the saltiness in this enormous sea come from?”

小树望见一条小河流进海里，又想起水杯里的淡水：“淡水没有这么咸，为什么许多河流汇进海洋，海水却这么咸呢？”

Xiaoshu spotted a small river flowing into the sea and thought of the fresh water in his cup. “Fresh water isn’t nearly this salty. Why is the ocean so salty when so many rivers flow into it?”

爸爸从山上讲起：“雨落在岩石和土壤上，流水一点点冲刷、风化岩石，其中一些矿物成分会溶进水里，形成带电的微小粒子。科学家叫它们‘离子’。”

Papa began in the mountains. “Rain falls on rocks and soil, and flowing water slowly weathers them. Some mineral components dissolve into the water as tiny charged particles called ions.”

“小溪汇成河流，河流每天都把很少量的离子送进海洋。河水里的离子很稀，所以不太咸；海洋却能在漫长岁月里把许多次微小的输入积累起来。”

“Streams join into rivers, and every day rivers deliver tiny amounts of ions to the ocean. The ions are very dilute in river water, so it is not very salty. But the ocean can accumulate countless small deliveries over an immense span of time.”

“河流不是唯一来源。海底的热液喷口会让海水和热岩石交换矿物成分，火山活动也会带来一些物质，让海水里的离子种类更丰富。”

“Rivers are not the only source. At hydrothermal vents, seawater exchanges minerals with hot rock, and volcanic activity also supplies some material, adding to the ocean’s mix of ions.”

“太阳晒着海面，水会变成水蒸气回到空气中，可溶在水里的大多数盐不会跟着飞走。水循环了一遍又一遍，盐大多留在海里。”

“Sunlight turns some seawater into water vapor that returns to the air, but most dissolved salts do not evaporate with it. The water cycles again and again while most salts remain in the ocean.”

退潮后，一小洼海水被晒干，岩石边留下细细的白色晶体。爸爸说：“海里也有生物、沉积物和海底岩石会带走一些离子，所以很长时间里，进入和离开的量大致保持着平衡。”

After the tide went out, a tiny pool dried and left fine white crystals around the rock. Papa said, “Ocean life, sediments, and reactions with seafloor rock also remove some ions, so over long periods the amounts coming in and going out stay in a broad balance.”

小树明白了：“原来一口咸味里，藏着岩石、河流和很久很久的时间！”一排海浪轻轻扑来，堆起白白的泡泡。他马上又问：“海浪为什么会有白泡泡呢？”

Xiaoshu understood. “So one salty taste carries a story of rocks, rivers, and a very, very long time!” A gentle wave rolled in and piled up white foam. He immediately asked, “Why do ocean waves make white bubbles?”

雨水和河流会从岩石中带走溶解的矿物离子，海底热液与火山活动也会带来或交换一些成分；水蒸发时盐大多留下，经过漫长岁月积累，并与海洋中的移除过程保持大致平衡。

Rain and rivers carry dissolved mineral ions from rocks, while hydrothermal vents and volcanic activity also add or exchange some material. Most salts stay behind when water evaporates, accumulating over immense time while removal processes keep the ocean in a broad balance.

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