Would there still be oxygen if the earth was only ocean?

Answer 1

Maussey, water is two hydrogen and one oxygen.

The amount of oxygen on the planet would be the same, but you wanted to know if it would be distributed much differently, right? There would still be a lot of oxygen gas in the atmosphere because of the vast amount of photosynthetic life in the oceans. Maybe of similar composition to what it is now.

Edit: Orion, I doubt that much oxygen comes from coral. They are animals. Phytoplankton are the primary source of free oxygen, not just of marine life, but of all biological sources on the planet.

Answer 2

Yes there would be oxygen. The first oxygen was released into the atmosphere by photosynthetic bluegreen "algae" (cyanobacteria), and today the phytoplankton and cyanobacteria produce over 50% of the Earth's oxygen through photosynthesis. Life on land would not have been possible without oxygen, because it was needed to form ozone in the stratosphere. This protected the organisms from ultraviolet radiation. This started happening when oxygen levels were only 1% (now they are about 20% of atmospheric gases). So the answer is YES.

Answer 3

Yes, because water is H2O, a molecule with oxygen. With only ocean, the earth will be full of marine life.

Answer 4

Actually yes, I've read somewhere that the coral in the ocean can produce oxygen. But I'm not sure whether it's true or not.

Answer 5

Yes since oxygen is slightly soluble in water there would still be an atmosphere
However in water, there are two atoms of oxygen

Answer 6

Yes. Most of our oxygen is produced by plant type plankton, (Blue/green algae), that live in the upper layers of the ocean.

BTW Orion, corals are animals, (oxygen consumers), not plants, (oxygen produceres).