Unit 4 Human Impacts on Earths Systems Test Pt. 2

Which substance might combine with water in the atmosphere to form acid rain?

• A. nitric acid
• B. ammonia
• C. citric acid
• D. hydrochloric acid

Fossil fuels can lead to acid precipitation. Acid precipitation damages trees, soils, and water supplies. What do fossil fuels generate that is needed to form acid precipitation?

• A. water
• B. energy
• C. gas pollutants
• D. particulate pollutants

Which source provides scientists with concentrations of oxygen-18 to determine past climate changes?

• A. fossils
• B. ice cores
• C. tree rings
• D. sea-floor sediment

Humans can cause different types of environmental pollution. When household cleaners are dumped down the drain and make their way into the water supply, which type of pollution has taken place?

• A. air pollution
• B. thermal pollution
• C. chemical pollution
• D. biological pollution

Humans can cause different types of pollution. When fertilizers and pesticides make their way into water systems, which type of pollution has taken place?

• A. air
• B. thermal
• C. chemical
• D. biological

Which activity is not a potential result of climate change?

• A. crop damage
• B. orbital change
• C. global warming
• D. sea-level change

Which event or activity is a natural cause of sudden changes in climate?

• A. ice age
• B. volcanic eruption
• C. burning fossil fuels
• D. tectonic plate movement

Humans can cause different types of environmental pollution. Which type of pollution is directly caused by humans dumping the remains of dead organisms into bodies of water?

• A. air pollution
• B. thermal pollution
• C. chemical pollution
• D. biological pollution

Which process is a common cause of acid rain?

• A. oil spilled into tropical ocean waters
• B. gases released when plants make food
• C. emissions produced by burning fossil fuels
• D. warm water released from nuclear power plants

There are many sources of air pollution in the United States and around the world. Some are natural sources, and others come from humans. Which example is a human source of air pollution?

• A. dust storms
• B. volcanic ash
• C. industrial emissions
• D. forest fires caused by lightning