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Cycle de l'oxygène

1:02EnglishBy Editions LarousseTranscribed Jul 28, 2026

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Oxygen is essential to life on

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Earth. Its cycle, closely linked to those of

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carbon and water, occurs

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primarily between the atmosphere and

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living organisms.

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The main sources of

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oxygen emissions are plants, such as

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trees on land, and phytoplankton

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in the oceans. In the atmosphere,

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ultraviolet rays transform

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oxygen into ozone;

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this is a cycle. This radiation

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also reduces ozone back to oxygen.

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Ultraviolet rays also

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produce oxygen through water molecules.

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The main consumers of

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oxygen are animals and

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plants through respiration.

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Human activities, such as the combustion of

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fossil fuels, also use

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oxygen. Volcanic activity

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also consumes oxygen; this oxygen binds

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to the carbon monoxide released during

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eruptions. Some oxygen

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disappears indirectly through

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sedimentation at the bottom of the oceans. On

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land, another part disappears through

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the oxidation of minerals, such as...

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