Oceans

The decrease of oxygen in water is referred to as what?

More Questions from Oceans
What is the world's largest coral reef?
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The Atlantic Ocean separates Brazil from which continent?
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In what way do porpoises differ from dolphins?
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What ocean lies between Asia and North and South America?
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What type of breeze rushes from the ocean to the land?
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Which of these oceans is the deepest?
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The longest river in the world is located on what continent?
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What did the earthquake that triggered the 2004 Indian Ocean tsunami register on the Richter scale?
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