SkillCat EPA 608 – Newly Updated
2026/2027 Exam Questions & Answers,
100% Guaranteed Pass || Complete A+
Guide
Question 1
What characteristic of CFCs makes them more likely than other chlorine
compounds to reach the stratosphere?
A) They are heavier than air
B) They do not dissolve in water
C) They have a strong odor
D) They are highly flammable
Answer: B) They do not dissolve in water
Rationale: CFCs are chemically stable and do not dissolve in water, allowing them
to remain in the atmosphere for extended periods and eventually reach the
stratosphere. Unlike water-soluble chlorine compounds that are removed by rain,
CFCs persist and rise to the stratosphere where UV radiation breaks them down,
releasing chlorine atoms that destroy ozone.
,Question 2
One molecule of chlorine in the stratosphere can destroy how many molecules
of ozone?
A) 10,000
B) 100,000
C) 1,000,000
D) 1,000
Answer: B) 100,000
Rationale: A single chlorine atom can catalytically destroy up to 100,000 ozone
molecules before it is removed from the stratosphere. This catalytic cycle makes
CFCs extremely damaging to the ozone layer even in small quantities.
Question 3
How many oxygen atoms does an ozone molecule contain?
A) 1
B) 2
C) 3
D) 4
Answer: C) 3
Rationale: Ozone (O₃) is a molecule composed of three oxygen atoms. This is in
contrast to the oxygen we breathe (O₂), which has two oxygen atoms.
,Question 4
Where is the majority of Earth's ozone located?
A) Troposphere
B) Stratosphere
C) Mesosphere
D) Thermosphere
Answer: B) Stratosphere
Rationale: The majority of Earth's ozone is located in the stratosphere,
approximately 10 to 30 miles above the Earth's surface. This stratospheric ozone
layer is crucial for absorbing and reflecting harmful ultraviolet radiation from the
sun.
Question 5
What is the primary function of ozone in the stratosphere?
A) To trap heat near the Earth's surface
B) To absorb and reflect UV rays from the sun
C) To produce oxygen for breathing
D) To regulate atmospheric pressure
Answer: B) To absorb and reflect UV rays from the sun
Rationale: The stratospheric ozone layer's major function is to absorb and reflect
harmful ultraviolet (UV) radiation from the sun. This protects living organisms from
UV-related health issues such as skin cancer and cataracts.
, Question 6
In which way does ozone depletion affect humans?
A) Increased risk of respiratory infections
B) Increased risk of skin cancer and cataracts
C) Increased risk of heart disease
D) Increased risk of neurological disorders
Answer: B) Increased risk of skin cancer and cataracts
Rationale: Ozone depletion allows more harmful UV radiation to reach the Earth's
surface, leading to increased risks of skin cancer, cataracts, and other UV-related
health problems in humans.
Question 7
Can chlorine in the stratosphere come from natural sources such as
volcanoes?
A) No, all stratospheric chlorine comes from human-made sources
B) Yes, but volcanoes are not the primary source
C) Yes, volcanoes are the primary source
D) No, volcanoes only release sulfur compounds
Answer: B) Yes, but volcanoes are not the primary source
2026/2027 Exam Questions & Answers,
100% Guaranteed Pass || Complete A+
Guide
Question 1
What characteristic of CFCs makes them more likely than other chlorine
compounds to reach the stratosphere?
A) They are heavier than air
B) They do not dissolve in water
C) They have a strong odor
D) They are highly flammable
Answer: B) They do not dissolve in water
Rationale: CFCs are chemically stable and do not dissolve in water, allowing them
to remain in the atmosphere for extended periods and eventually reach the
stratosphere. Unlike water-soluble chlorine compounds that are removed by rain,
CFCs persist and rise to the stratosphere where UV radiation breaks them down,
releasing chlorine atoms that destroy ozone.
,Question 2
One molecule of chlorine in the stratosphere can destroy how many molecules
of ozone?
A) 10,000
B) 100,000
C) 1,000,000
D) 1,000
Answer: B) 100,000
Rationale: A single chlorine atom can catalytically destroy up to 100,000 ozone
molecules before it is removed from the stratosphere. This catalytic cycle makes
CFCs extremely damaging to the ozone layer even in small quantities.
Question 3
How many oxygen atoms does an ozone molecule contain?
A) 1
B) 2
C) 3
D) 4
Answer: C) 3
Rationale: Ozone (O₃) is a molecule composed of three oxygen atoms. This is in
contrast to the oxygen we breathe (O₂), which has two oxygen atoms.
,Question 4
Where is the majority of Earth's ozone located?
A) Troposphere
B) Stratosphere
C) Mesosphere
D) Thermosphere
Answer: B) Stratosphere
Rationale: The majority of Earth's ozone is located in the stratosphere,
approximately 10 to 30 miles above the Earth's surface. This stratospheric ozone
layer is crucial for absorbing and reflecting harmful ultraviolet radiation from the
sun.
Question 5
What is the primary function of ozone in the stratosphere?
A) To trap heat near the Earth's surface
B) To absorb and reflect UV rays from the sun
C) To produce oxygen for breathing
D) To regulate atmospheric pressure
Answer: B) To absorb and reflect UV rays from the sun
Rationale: The stratospheric ozone layer's major function is to absorb and reflect
harmful ultraviolet (UV) radiation from the sun. This protects living organisms from
UV-related health issues such as skin cancer and cataracts.
, Question 6
In which way does ozone depletion affect humans?
A) Increased risk of respiratory infections
B) Increased risk of skin cancer and cataracts
C) Increased risk of heart disease
D) Increased risk of neurological disorders
Answer: B) Increased risk of skin cancer and cataracts
Rationale: Ozone depletion allows more harmful UV radiation to reach the Earth's
surface, leading to increased risks of skin cancer, cataracts, and other UV-related
health problems in humans.
Question 7
Can chlorine in the stratosphere come from natural sources such as
volcanoes?
A) No, all stratospheric chlorine comes from human-made sources
B) Yes, but volcanoes are not the primary source
C) Yes, volcanoes are the primary source
D) No, volcanoes only release sulfur compounds
Answer: B) Yes, but volcanoes are not the primary source
