The Large Amount of Free Oxygen in Earth's Present Atmosphere

question 150

Multiple Choice

The large amount of free oxygen in Earth's present atmosphere is primarily a result of

• A) outgassing by volcanoes and other geological processes.
• B) biological processes such as photosynthesis.
• C) splitting of carbon dioxide into carbon and oxygen by solar ultraviolet light.
• D) carbon dioxide becoming dissolved in the oceans, releasing oxygen.

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Definitions:

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