11. What is the name of the layer of gases that surround the Earth?
A) Atmosphere
B) Hydrosphere
C) Biosphere
D) Geosphere
Answer: A) Atmosphere
12. Which gas makes up the majority of the Earth’s atmosphere?
A) Nitrogen
B) Oxygen
C) Carbon dioxide
D) Helium
Answer: A) Nitrogen
13. What is the process by which plants convert sunlight into energy?
A) Respiration
B) Photosynthesis
C) Fermentation
D) Combustion
Answer: B) Photosynthesis
14. Which layer of the Earth’s atmosphere contains the ozone layer?
A) Troposphere
B) Stratosphere
C) Mesosphere
D) Thermosphere
Answer: B) Stratosphere
15. What is the name of the layer of Earth’s atmosphere where most weather occurs?
A) Troposphere
B) Stratosphere
C) Mesosphere
D) Thermosphere
Answer: A) Troposphere
