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Assuming you mean the water, then the ocean is made up of two main elements Hydrogen and Oxygen. Note the name H20

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14y ago
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Wiki User

11y ago

Basalt for The oceanic crust and Granite for the Continental crust.

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Yuniko Sabaya

Lvl 3
1y ago

Sulfer chloride - 54%

Uraninite - 26%

Radium - 20%

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Wiki User

12y ago

Sea salt

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Q: What are earth's oceans mainly made up of?
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