Photosynthesis provided the Earth with an oxygen-rich atmosphere.
Does Earth have an oxygen-rich atmosphere?
Earth's surface environments are highly oxygenated from the atmosphere to the deepest reaches of the oceans, representing a hallmark of an active photosynthetic biosphere. However, the fundamental timescale of the oxygen-rich atmosphere on Earth remains uncertain, particularly for the distant future.
What provides the most oxygen on Earth?
Scientists estimate that 50-80% of the oxygen production on Earth comes from the ocean. The majority of this production is from oceanic plankton drifting plants, algae, and some bacteria that can photosynthesize
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