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1. What is air composed of?
a. Oxygen and Nitrogen
b. Hydrogen and Carbon
c. Helium and Argon
d. Carbon dioxide and Water vapor

Answer: a. Oxygen and Nitrogen



2. Which gas makes up the majority of Earth's atmosphere?
a. Oxygen
b. Nitrogen
c. Carbon dioxide
d. Hydrogen

Answer: b. Nitrogen



3. What gas do plants absorb from the air during photosynthesis?
a. Oxygen
b. Carbon dioxide
c. Nitrogen
d. Hydrogen

Answer: b. Carbon dioxide



4. What is the approximate percentage of oxygen in the air?
a. 21%
b. 50%
c. 78%
d. 10%

Answer: a. 21%



5. Which layer of the atmosphere contains the ozone layer?
a. Troposphere
b. Stratosphere
c. Mesosphere
d. Thermosphere

Answer: b. Stratosphere



6. What is the role of the ozone layer in the atmosphere?
a. Absorbing ultraviolet (UV) radiation
b. Producing oxygen
c. Absorbing carbon dioxide
d. Creating rain

Answer: a. Absorbing ultraviolet (UV) radiation



7. Which gas do humans and animals inhale from the air?
a. Nitrogen
b. Oxygen
c. Carbon dioxide
d. Hydrogen

Answer: b. Oxygen



8. What is the process by which plants release water vapor into the air?
a. Transpiration
b. Condensation
c. Evaporation
d. Precipitation

Answer: a. Transpiration



9. Which layer of the atmosphere is closest to the Earth's surface?
a. Troposphere
b. Stratosphere
c. Mesosphere
d. Thermosphere

Answer: a. Troposphere



10. What is the process of the Earth's surface warming up due to the sun's rays?
a. Conduction
b. Convection
c. Radiation
d. Insulation

Answer: c. Radiation



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