Question

1. why is smog a more serious problem in the southern united states than in the northern united states?

a. global warming is worse in the southern united states.
b. acid rain is worse in the southern united states.
c. sunlight is more abundant in the southern united states.
d. there are more pollutants in the northern united states.

1. which of the following is correct?

a. all ozone in the atmosphere is helpful.
b. all ozone in the atmosphere is harmful.
c. ozone in the stratosphere is helpful but ground - level ozone is harmful.
d. ozone in the stratosphere is harmful but ground - level ozone is helpful.

1. what is one of the main causes of air pollution?

a. habitat destruction
b. aerosol sprays
c. nuclear power plants
d. runoff

1. what impact does uv radiation have on humans?

a. cataracts
b. lung cancer
c. skin cancer
d. a & c are correct
e. b & c are correct

1. what is one of the main causes of water pollution?

a. habitat destruction
b. aerosol sprays
c. nuclear power plants
d. runoff

1. algae is a photosynthetic organism that produces 70% of the atmospheric oxygen. why are algal blooms bad?

a. algal blooms use up a lot of oxygen and block incoming sunlight to other organisms.
b. algal blooms produce too much oxygen and suffocate organisms with too much oxygen.
c. algal blooms release carbon dioxide to surrounding organisms.
d. algal blooms are very beneficial to the environment.

Explanation:

1. Smog formation involves photochemical reactions. More sunlight in the southern US (option c) promotes these reactions. Global warming (a) and acid rain (b) are not directly related to smog's severity difference. Option d is incorrect as there's no indication northern US has fewer pollutants.
2. Stratospheric ozone protects from UV (helpful), ground - level ozone (from pollution) is harmful (option c). Options a and b are wrong as ozone's effect depends on location. Option d has the opposite correct relationship.
3. Aerosol sprays (option b) release pollutants contributing to air pollution. Habitat destruction (a) affects ecosystems, nuclear power plants (c) have radiation concerns (not main air pollution cause here), runoff (d) is water pollution related.
4. UV radiation causes cataracts (a) and skin cancer (c), so d (A & C are correct) is right. Lung cancer (b) is more linked to smoking/air pollutants (not directly UV in this context).
5. Runoff (option d) carries pollutants into water (main water pollution cause here). Habitat destruction (a) is ecosystem - wide, aerosol sprays (b) air pollution, nuclear power plants (c) radiation (not main water pollution here).
6. Algal blooms grow rapidly, use oxygen (in decomposition) and block sunlight (option a). They don't produce 'too much' harmful oxygen (b wrong), release oxygen (not CO₂ in this bad - effect context, c wrong), and are not beneficial (d wrong).

Answer:

1. c. Sunlight is more abundant in the southern United States.
2. c. Ozone in the stratosphere is helpful but ground - level ozone is harmful.
3. b. Aerosol sprays
4. d. A & C are correct
5. d. Runoff
6. a. Algal blooms use up a lot of oxygen and block incoming sunlight to other organisms.