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Oceans are predominately water, which is hydrogen and oxygen, but they also have a considerable amount of salt in them. That's sodium and chlorine ions. Dissolved oxygen is present, or fish and a lot of other animals would die. Carbon dioxide (CO2, which is carbon and oxygen) as well as a number of other gases are also present. Just about any element that can become soluble (including gold) and is washed downstream from rivers can be found in sea water.

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