ACID RAIN SCORING 2

Full Credit

Code 2:

Any one of car exhausts, factory emissions, burning fossil fuels such as oil and coal, gases from volcanoes or other similar things.

• Burning coal and gas.

• Oxides in the air come from pollution from factories and industries.

• Volcanoes.

• Fumes from power plants. [«Power plants» is taken to include power plants that burn fossil fuels.] • They come from the burning of materials that contain sulfur and nitrogen.

Partial Credit

Code 1:

Responses that include an incorrect as well as a correct source of the pollution.

• Fossil fuel and nuclear power plants. [Nuclear power plants are not a source of acid rain.]

• The oxides come from the ozone, atmosphere and meteors coming toward Earth. Also the burning of fossil fuels.

Responses that refer to «pollution» but do not give a source of pollution that is a significant cause of acid rain.

• Pollution.

• The environment in general, the atmosphere we live in – e.g., pollution.