Which layer of the atmosphere is directly above the troposphere?
a) Stratosphere
b) Mesosphere
c) Thermosphere
d) Exosphere
Answer: a) Stratosphere

The natural process by which gases trap heat in the Earth’s atmosphere is known as:
a) Ozone depletion
b) Greenhouse effect
c) Acid rain
d) Smog
Answer: b) Greenhouse effect

Which of the following is a consequence of ozone layer depletion?
a) Increased ultraviolet radiation reaching Earth
b) Increased greenhouse gases
c) Decreased carbon dioxide levels
d) Enhanced global warming
Answer: a) Increased ultraviolet radiation reaching Earth

The greenhouse gas produced by livestock is:
a) Carbon dioxide
b) Methane
c) Nitrous oxide
d) Chlorofluorocarbons (CFCs)
Answer: b) Methane

The atmosphere becomes thinner as:
a) Altitude decreases
b) Altitude increases
c) Temperature increases
d) Temperature decreases
Answer: b) Altitude increases

Which process in plants removes carbon dioxide from the atmosphere?
a) Respiration
b) Photosynthesis
c) Combustion
d) Decomposition
Answer: b) Photosynthesis

Which layer of the atmosphere is known for its ionized gases?
a) Troposphere
b) Stratosphere
c) Mesosphere
d) Thermosphere
Answer: d) Thermosphere

The most harmful form of ultraviolet radiation is:
a) UV-A
b) UV-B
c) UV-C
d) All are equally harmful
Answer: c) UV-C

Which of the following contributes to the formation of smog?
a) Oxygen
b) Ozone
c) Sulfur dioxide
d) Carbon monoxide
Answer: b) Ozone

The phenomenon where pollutants form a brownish haze over cities is called:
a) Acid rain
b) Global warming
c) Photochemical smog
d) Ozone depletion
Answer: c) Photochemical smog