Biology 6.2

Multiple Choice

Desertification is the process through which

• a desert becomes unsuitable for any plant or animal life to exist

• an area with a dry climate turns into a desert due to farming, overgrzing, drought, or climate change

• a lush forest is destroyed by erosion

• a farmland is abandoned by humans & stops producing food crops

Multiple Choice

A nonpoint source of a pollutant might be

• oil washed off a roadway by rain

• a factory waste being dumped into a stream

• smoke enetering the atmosphere from a paper manufacturing plant

• radioactive waste leaching into the ground from a nuclear reactor explosion

Multiple Choice

While ozone in the upper atmosphere is beneficial to humans, ozone at ground level is dangerous because

• it worsens the health of people with respiratory problems

• it reduces visibility when driving

• ozone at ground level is a major cause of climate change

• it causes more ultraviolet rays to reach Earth's surface

Multiple Choice

Burning fossil fuels contributes to

• the production of acid rain

• the release of particulates into the air

• increased levels of carbon dioxide in the atmosphere

• all of these