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11. What instrument is used to measure air pressure?
a. Thermometer
b. Barometer
c. Hydrometer
d. Anemometer
Answer: b. Barometer

12. What is the main cause of wind?
a. Gravity
b. Air pressure differences
c. Earth's rotation
d. Temperature changes
Answer: b. Air pressure differences

13. Which gas is responsible for the greenhouse effect?
a. Oxygen
b. Nitrogen
c. Carbon dioxide
d. Hydrogen
Answer: c. Carbon dioxide

14. What is the layer of warm air above the Earth's surface called?
a. Stratosphere
b. Troposphere
c. Mesosphere
d. Thermosphere
Answer: b. Troposphere

15. What causes thunderstorms and lightning?
a. Tornadoes
b. Cumulonimbus clouds
c. Cirrus clouds
d. Stratus clouds
Answer: b. Cumulonimbus clouds

16. What is the process of water vapor turning into liquid water called?
a. Evaporation
b. Condensation
c. Precipitation
d. Transpiration
Answer: b. Condensation

17. Which gas do humans and animals exhale into the air?
a. Nitrogen
b. Oxygen
c. Carbon dioxide
d. Hydrogen
Answer: c. Carbon dioxide

18. What is the layer of the atmosphere where weather events occur?
a. Stratosphere
b. Troposphere
c. Mesosphere
d. Thermosphere
Answer: b. Troposphere

19. What causes the Earth's seasons?
a. Earth's rotation
b. Earth's orbit around the sun
c. Changes in air pressure
d. Ozone depletion
Answer: b. Earth's orbit around the sun

20. Which gas is used by plants during photosynthesis?
a. Oxygen
b. Nitrogen
c. Carbon dioxide
d. Hydrogen
Answer: c. Carbon dioxide

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