61. What is the name of the atmospheric phenomenon that causes the Southern Lights?
a) Ozone depletion
b) Greenhouse effect
c) Solar wind
d) Ionosphere
62. Which of the following is a common indoor air pollutant that can cause lung cancer?
a) Carbon monoxide
b) Nitrogen dioxide
c) Radon
d) Oxygen
63. What is the name of the atmospheric layer where most weather occurs?
a) Troposphere
b) Stratosphere
c) Mesosphere
d) Thermosphere
64. Which of the following is a common source of indoor air pollution?
a) Industrial emissions
b) Motor vehicle emissions
c) Tobacco smoke
d) Volcanic eruptions
65. What is the name of the atmospheric layer where most commercial airplanes fly?
a) Troposphere
b) Stratosphere
c) Mesosphere
d) Thermosphere
