Point 8 of 21 — Module 9 — Components and Layers of the AtmosphereQuestion bank: 0 questions (0 with pictures)
08 3.4 Carbon dioxide (CO₂) — about 0.04 %
Its concentration varies considerably from one region to another (higher near cities, lower over forests during the day) and from season to season.
It is a greenhouse gas that traps heat in the atmosphere and prevents it from escaping into space — the greenhouse effect (Module 12). It is also the carbon source for plants (photosynthesis).
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