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Correct Answer: D) Both a and c.
Correct Answer: A) Arctic sea ice melting.
Correct Answer: D) Towns and Cities on cliffs.
Correct Answer: A) Chlorofluorocarbons.
Correct Answer: B) Photochemical Smog.
Correct Answer: A) City's high elevation.
Correct Answer: A) Nitrogen Oxides and Sulfur Oxides.
Correct Answer: C) The burning of fossil fuels.
Correct Answer: D) A volatile organic compound.
Correct Answer: C) Carbon Oxides.
Correct Answer: A) Clean Air Act.
Correct Answer: B) When it is in the stratosphere.
Correct Answer: D) Oxygen gas (O).
Correct Answer: B) China.
Correct Answer: B) Nitrogen.
Correct Answer: D) Reducing the number of cows we raise for meat.
Correct Answer: D) Scrubber.
Correct Answer: D) They all burn fossil fuels.
Correct Answer: C) Burning fossil fuels and industrial processes.
Correct Answer: D) 78%.
Correct Answer: C) A base.
Correct Answer: A) Troposphere.
Correct Answer: B) Troposphere.
Correct Answer: C) Tempeture inversion.
Correct Answer: D) Restricted automobile use in the city.