ENV 101 Exam 4 V2 | ENV 101
Environmental Science | StraighterLine |
Q&A with Rationale (StraighterLine
ENV101 Exam 4)
1. Which of the following is defined as a primary pollutant because it is released directly into
the atmosphere in a harmful form?
A. Ozone
B. Sulfuric acid
C. Carbon monoxide
D. Photochemical smog
Answer: C
Rationale: Carbon monoxide is considered a primary pollutant because it is emitted
directly from a source, such as vehicle exhaust or industrial processes. In contrast,
secondary pollutants like ozone and sulfuric acid form through chemical reactions in the
atmosphere. Identifying the source of emissions is critical for environmental monitoring
and regulatory compliance under the Clean Air Act.
2. What phenomenon occurs when a layer of warmer air traps cooler air at the earth’s
surface, preventing the dispersion of pollutants?
A. Thermal inversion
,B. The Coriolis effect
C. Acid deposition
D. The greenhouse effect
Answer: A
Rationale: A thermal inversion happens when the normal temperature profile of the
atmosphere is reversed, with warm air sitting on top of cold air. This stable configuration
prevents air from rising and mixing, which effectively traps smog and smoke near the
ground. Many urban areas surrounded by mountains are particularly susceptible to this
weather pattern and its associated health risks.
3. Which greenhouse gas has the highest global warming potential per molecule, even though
it exists in lower concentrations than CO2?
A. Nitrous oxide
B. Methane
C. Chlorofluorocarbons (CFCs)
D. Water vapor
Answer: C
Rationale: CFCs are extremely potent greenhouse gases that can trap thousands of times
more heat per molecule than carbon dioxide. While their atmospheric concentration is
much lower than CO2, their longevity and heat-trapping efficiency make them significant
, contributors to climate change. Most CFCs have been phased out globally due to their
additional role in depleting the stratospheric ozone layer.
4. What is the primary environmental concern associated with the use of ‘fracking’ (hydraulic
fracturing) to extract natural gas?
A. Groundwater contamination
B. Ozone layer depletion
C. Increased ultraviolet radiation
D. Desertification
Answer: A
Rationale: Hydraulic fracturing involves injecting high-pressure fluids underground to
break rock formations, which poses a risk of chemicals leaking into local aquifers.
Furthermore, the disposal of wastewater produced during this process has been linked to
increased seismic activity and surface water pollution. Regulatory bodies continue to
debate the long-term impacts of this technology on public health and domestic water
security.
5. Which of the following describes ‘passive solar’ heating?
A. Using photovoltaic cells to generate electricity
B. Focusing sunlight with mirrors to boil water
C. Designing a building to capture and store heat without mechanical pumps
Environmental Science | StraighterLine |
Q&A with Rationale (StraighterLine
ENV101 Exam 4)
1. Which of the following is defined as a primary pollutant because it is released directly into
the atmosphere in a harmful form?
A. Ozone
B. Sulfuric acid
C. Carbon monoxide
D. Photochemical smog
Answer: C
Rationale: Carbon monoxide is considered a primary pollutant because it is emitted
directly from a source, such as vehicle exhaust or industrial processes. In contrast,
secondary pollutants like ozone and sulfuric acid form through chemical reactions in the
atmosphere. Identifying the source of emissions is critical for environmental monitoring
and regulatory compliance under the Clean Air Act.
2. What phenomenon occurs when a layer of warmer air traps cooler air at the earth’s
surface, preventing the dispersion of pollutants?
A. Thermal inversion
,B. The Coriolis effect
C. Acid deposition
D. The greenhouse effect
Answer: A
Rationale: A thermal inversion happens when the normal temperature profile of the
atmosphere is reversed, with warm air sitting on top of cold air. This stable configuration
prevents air from rising and mixing, which effectively traps smog and smoke near the
ground. Many urban areas surrounded by mountains are particularly susceptible to this
weather pattern and its associated health risks.
3. Which greenhouse gas has the highest global warming potential per molecule, even though
it exists in lower concentrations than CO2?
A. Nitrous oxide
B. Methane
C. Chlorofluorocarbons (CFCs)
D. Water vapor
Answer: C
Rationale: CFCs are extremely potent greenhouse gases that can trap thousands of times
more heat per molecule than carbon dioxide. While their atmospheric concentration is
much lower than CO2, their longevity and heat-trapping efficiency make them significant
, contributors to climate change. Most CFCs have been phased out globally due to their
additional role in depleting the stratospheric ozone layer.
4. What is the primary environmental concern associated with the use of ‘fracking’ (hydraulic
fracturing) to extract natural gas?
A. Groundwater contamination
B. Ozone layer depletion
C. Increased ultraviolet radiation
D. Desertification
Answer: A
Rationale: Hydraulic fracturing involves injecting high-pressure fluids underground to
break rock formations, which poses a risk of chemicals leaking into local aquifers.
Furthermore, the disposal of wastewater produced during this process has been linked to
increased seismic activity and surface water pollution. Regulatory bodies continue to
debate the long-term impacts of this technology on public health and domestic water
security.
5. Which of the following describes ‘passive solar’ heating?
A. Using photovoltaic cells to generate electricity
B. Focusing sunlight with mirrors to boil water
C. Designing a building to capture and store heat without mechanical pumps
