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Over time the density of salt in surface waters can increase. What is the cause of this increase?

As density increases the amount of salts in the water- also known as salinity increases

Explanation:

the earthquake in haiti was a magnitude of 7.0 according to the u.s geological survey yet the smaller earthquake in haiti killed more than 200,000 and left more than 1.2 million people homeless. the chile earthquake was a magnitude of 8.8 and 500 times more stronger but chile's earthquake only injured 712 people.

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