Which three gases matter most in the layer of air around the Earth?
ANitrogen, oxygen, carbon dioxide
BNitrogen, helium, carbon dioxide
CHydrogen, oxygen, carbon dioxide
DNitrogen, oxygen, carbon monoxide
Answer & Solution
Correct answer: A. Nitrogen, oxygen, carbon dioxide
1. The atmosphere is the layer of gases wrapped around the Earth.
2. Its three most important gases are nitrogen, oxygen and carbon dioxide.
3. Animals need the oxygen and plants need the carbon dioxide.
_Source: Siyavula Natural Sciences Grade 7 (CC BY 4.0), Atmosphere_