NTA Environmental Science 2

Question 1

What is the primary cause of the depletion of the ozone layer?

Accepted Answer

Chlorofluorocarbons (CFCs)

Answer

CFCs, once used in refrigerants and aerosols, release chlorine atoms in the stratosphere that destroy ozone molecules.

Question 2

Which of the following is an example of a non-renewable resource?

Accepted Answer

Coal

Answer

Coal is a fossil fuel formed over millions of years and cannot be replenished on a human timescale.

Question 3

The food chain begins with:

Accepted Answer

Producers (plants)

Answer

Producers, such as plants, are at the base of the food chain because they convert sunlight into chemical energy.

Question 4

What percentage of Earth's water is fresh water?

Accepted Answer

About 3%

Answer

Only approximately 3% of Earth's water is fresh water; the remaining 97% is salt water.

Question 5

The EPA (Environmental Protection Agency) in the United States was established in which year?

Accepted Answer

1970

Answer

The EPA was established in December 1970 under President Nixon to protect human health and the environment.

NTA - National Testing Agency Practice Test