1
, EPA SECTION 608 CORE EXAM AND PRACTICE EXAM
NEWEST 2026 TEST BANK| COMPLETE 650 REAL EXAM
QUESTIONS AND CORRECT VERIFIED ANSWERS/
ALREADY GRADED A+| EPA SECTION 608 CORE
EXAM PREP 2026 (MOST RECENT!!)
1. What is the chemical formula of a stratospheric ozone
molecule?
A) O₂
B) O₃
C) CO₂
D) ClO
Answer: B) O₃
*Rationale: Ozone is a molecule composed of three oxygen
atoms (O3). This is distinct from the oxygen we breathe (O2). The
2
,stratospheric ozone layer absorbs 95-99% of the sun's harmful
ultraviolet (UV) radiation .*
2. Where is the majority of the Earth’s protective ozone layer
located?
A) Troposphere
B) Stratosphere
C) Mesosphere
D) Thermosphere
Answer: B) Stratosphere
Rationale: While ozone exists in other atmospheric layers, the
"ozone layer" is specifically located in the stratosphere,
approximately 6 to 30 miles above the Earth's surface .
3. Which atom in a CFC molecule is primarily responsible for
destroying ozone in the stratosphere?
A) Fluorine
B) Carbon
3
, C) Chlorine
D) Hydrogen
Answer: C) Chlorine
Rationale: When UV light breaks down a CFC molecule in the
stratosphere, it releases a chlorine atom. This free chlorine atom
acts as a catalyst, breaking apart thousands of ozone molecules
before it is deactivated .
4. Why do CFCs reach the stratosphere more easily than many
other chemicals?
A) They are heavier than air, so they sink into the upper
atmosphere.
B) They are magnetic and are pulled toward the poles.
C) They are very stable (non-reactive) in the lower atmosphere.
D) They are water-soluble and rise with evaporation.
Answer: C) They are very stable (non-reactive) in the lower
atmosphere.
4
, EPA SECTION 608 CORE EXAM AND PRACTICE EXAM
NEWEST 2026 TEST BANK| COMPLETE 650 REAL EXAM
QUESTIONS AND CORRECT VERIFIED ANSWERS/
ALREADY GRADED A+| EPA SECTION 608 CORE
EXAM PREP 2026 (MOST RECENT!!)
1. What is the chemical formula of a stratospheric ozone
molecule?
A) O₂
B) O₃
C) CO₂
D) ClO
Answer: B) O₃
*Rationale: Ozone is a molecule composed of three oxygen
atoms (O3). This is distinct from the oxygen we breathe (O2). The
2
,stratospheric ozone layer absorbs 95-99% of the sun's harmful
ultraviolet (UV) radiation .*
2. Where is the majority of the Earth’s protective ozone layer
located?
A) Troposphere
B) Stratosphere
C) Mesosphere
D) Thermosphere
Answer: B) Stratosphere
Rationale: While ozone exists in other atmospheric layers, the
"ozone layer" is specifically located in the stratosphere,
approximately 6 to 30 miles above the Earth's surface .
3. Which atom in a CFC molecule is primarily responsible for
destroying ozone in the stratosphere?
A) Fluorine
B) Carbon
3
, C) Chlorine
D) Hydrogen
Answer: C) Chlorine
Rationale: When UV light breaks down a CFC molecule in the
stratosphere, it releases a chlorine atom. This free chlorine atom
acts as a catalyst, breaking apart thousands of ozone molecules
before it is deactivated .
4. Why do CFCs reach the stratosphere more easily than many
other chemicals?
A) They are heavier than air, so they sink into the upper
atmosphere.
B) They are magnetic and are pulled toward the poles.
C) They are very stable (non-reactive) in the lower atmosphere.
D) They are water-soluble and rise with evaporation.
Answer: C) They are very stable (non-reactive) in the lower
atmosphere.
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