🌊 Composition of Seawater

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7 Terms

1
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What is the average salinity of seawater?

35‰ (3.5%).

2
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What is the major salt in seawater?

Sodium chloride (NaCl).

3
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What are two sources of ocean salinity?

Chemical weathering of rocks and volcanic outgassing.

4
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What factors decrease ocean salinity?

Precipitation, runoff, melting icebergs, and melting sea ice.

5
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What is the average pH of ocean water?

8.1.

6
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How does CO₂ affect ocean water pH?

It decreases pH, making the water more acidic.

7
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Why is carbonic acid bad for marine organisms?

It can damage coral and dissolve shells/teeth.