Point 6 of 21 — Module 9 — Components and Layers of the AtmosphereQuestion bank: 0 questions (0 with pictures)
06 3.2 Oxygen (O₂) — about 21 %
One of the most abundant gases in the atmosphere; it is mainly produced by photosynthesis of food-producing organisms (plants, algae, cyanobacteria).
It is chemically active; essential for the respiration of organisms; plays a key role in combustion and in natural and industrial oxidation reactions (rusting, burning, making steel, etc.).
About 21 % of the air by volume (about 23 % by mass).
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