D. Tick the correct answer
1. Which of these gases is essential for respiration?
Nitrogen Oxygen
Carbon dioxide
Ozone
2. How much of the atmospheric mass is concentrated within the first 32 km above the
surface?
90 per cent
95
per
99 per cent
100 per cent
3. Which gas is a significant contributor to the greenhouse effect?
Helium
Hydrogen O Argon
Carbon dioxide
4. In which layer of the atmosphere is oxygen found?
Thermosphere
Troposphere Stratosphere Mesosphere
5. Which layer of the atmosphere is closest to interplanetary space?
Troposphere
Exosphere Thermosphere Mesosphere
Answers
Answered by
6
Answer:
1) oxygen
2)99
3)carbondioxide
4)troposphere
5)exosphere
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