海水为什么是咸的短文★★★★★
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Children are often told that the sea is salty, but few can say why.
大人常跟小孩说海是咸的，可很少有人能说清为什么。
The short answer is the rain. Rain falls on the land, and the water runs down into the rivers.
短的回答是雨。雨落在地上，水顺着往下走，进了河。
On its way, that water touches stone and soil, and it takes away very small pieces of salt.
一路上，这些水碰到石头和土，就带走一点点很小的盐。
The rivers carry the salt to the sea, and there it stays, because only the water goes back up.
河把盐带到海里，盐就留在那儿，因为上去的只有水。
Over millions of years the sea became more and more salty, while the rivers stayed sweet.
几百万年下来，海越来越咸，河还是淡的。
There is one more thing: some salt also comes from holes in the sea floor, where hot water meets cold stone.
还有一件事：有些盐是从海底的洞里出来的，那儿热水碰上冷石头。
So the sea is not salty because someone put salt in it. It is salty because the land gives a little away every single day, and never takes it back.
所以海不是谁往里放了盐才咸。是陆地每天都在往外给一点点，再也不收回去。