36. Which of the following is a common greenhouse gas?
a) Carbon monoxide
b) Nitrogen
c) Methane
d) Oxygen
Answer: c) Methane
37. Which of the following is not a type of air pollution?
a) Smog
b) Acid rain
c) Ozone depletion
d) Ocean acidification
Answer: d) Ocean acidification
38. Which of the following is a common source of indoor air pollution?
a) Cars
b) Factories
c) Smoking
d) Forest fires
Answer: c) Smoking
39. Which of the following is not a component of the Earth’s atmosphere?
a) Nitrogen
b) Oxygen
c) Carbon monoxide
d) Argon
Answer: c) Carbon monoxide
40. What is the name of the process by which carbon dioxide is released into the atmosphere by burning fossil fuels?
a) Respiration
b) Combustion
c) Carbon sequestration
d) Erosion
Answer: b) Combustion
