# Where does oxygen come from on earth?

**Published by:** [Mary](https://paragraph.com/@mary-31/)
**Published on:** 2023-02-10
**URL:** https://paragraph.com/@mary-31/where-does-oxygen-come-from-on-earth

## Content

Most people think that the main source of oxygen is our forests with trees, grass and plants. But as it turned out, all vegetation on land emits only 20% of the earth's oxygen. The remaining 80% of oxygen is given to us by the seas and oceans due to phytoplankton. These are microscopic algae that release a huge amount of oxygen as a result of the photosynthesis reaction.

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