Question

1. considered harmful in the troposphere but beneficial in the stratosphere:

a. sulfur dioxide
b. lead
c. ozone
d. lead

1. which of the following best describes the importance of ozone in the stratosphere to life on earth?

a. ozone reflects x - rays from the sun back into space.
b. ozone absorbs most of the ultraviolet radiation from the sun.
c. ozone helps to moderate surface temperature by absorbing co2 and ch4.
d. ozone increases mutation rates and accelerates evolution in a variety of species.

Explanation:

1. Sulfur dioxide is a pollutant in the troposphere causing issues like acid - rain, but ozone in the stratosphere forms the ozone layer which protects life from harmful UV radiation. Lead is a heavy - metal pollutant with no such dual - natured role in different atmospheric layers.
2. Ozone in the stratosphere absorbs most of the ultraviolet radiation from the Sun, protecting life on Earth from the harmful effects of excessive UV exposure. It does not reflect X - rays, moderate surface temperature by absorbing CO2 and CH4, or increase mutation rates.

Answer:

1. a. Sulfur dioxide
2. b. Ozone absorbs most of the ultraviolet radiation from the Sun.