If you go to the seaside，you will know that seawater leaves marks on your clothes，water evaporates（蒸發） from the surface of the sea but the salt remains. （1）GG The answer is no.The oceans have stayed at about 3.5 percent salt content for hundreds of millions of years.It maintains a constant level of salt in different ways.
Pick up a shell and weigh it in your hand.It is heavy.All creatures need sodium to live and most need calcium to build bones and shells.（2）DDWhen creatures die，their salt is locked up in bones and shells.jye.ai drop to the bottom of the sea.
（3）EESea salt not only dissolves from rocks，it also reacts with the rocks of the ocean crust（外殼） and volcanic lava.The reactions take some of the salts in seawater away from the sea.
The outer hard crust of Earth is made up of a dozen or so hard plates that drift on extremely hot，soft rock like floating islands on a sea.（4）FFWhen an ocean plate bumps into a land plate，the less dense land plate floats over the ocean one.The ocean floor gets pushed under，and its salty rocks，along with shells and bones，are lost deep within Earth. （5）CC
A.That's because there is abundant salt in the seas.
B.Have you got any idea of why the seas are salty？
C.That's why the seas are salty but don't get any saltier.
D.Crabs get their sodium and calcium from the seawater.
E.Reactions between seawater and rocks are not just one way.
F.The heat isn't the same，causing the movement of the plates.
G.Have you ever thought about whether the seas will keep getting saltier？
【考點】人與自我．
【答案】G；D；E；F；C
【解答】
【點評】
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發布：2024/4/20 14:35:0組卷：1引用：1難度：0.5
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Betty發布：2025/1/30 8:0:1組卷：12引用：2難度：0.5