Which is a negative impact of dams?, They help generate electricity., They can block migratory fish., They store freshwater., They provide water for irrigation., Which correctly describes something that can have both a positive and negative impact on the environment?, Recycling paper, Using less water at home, Picking up litter, Building a dam, How can a dam change the ecosystem around a river?, It can affect water flow, erosion, biodiversity, and fish migration., It stops the need for freshwater., It makes all animals leave immediately., It prevents any change in the river., What is an aquifer?, A machine used to pump groundwater, A river that flows underground, An area of permeable rock or sediment that holds significant amounts of water, A lake used for drinking water, What does an aquifer store?, Fossils only, Air, Saltwater, Groundwater, What can happen if groundwater is removed from an aquifer faster than it is replaced?, Wells may run dry and sinkholes can form, The water level rises, More aquifers form, Rivers become deeper immediately, During a drought, why might the water level in a well drop?, Aquifers produce less rock, Groundwater changes into saltwater, Less precipitation replaces the groundwater being used, More groundwater is being replaced than removed, After a rainstorm, muddy water washes into a pond. What most likely caused this problem?, A neighbor correctly disposed of chemicals., Some shrubs and trees were removed from the yard., Less chemical fertilizer was used in the yard., A new aquifer was drilled in the neighborhood., Why did the river water look brown and muddy after trees were cleared?, The aquifer released clean water into the river., The river produced extra soil by itself., The trees changed into mud after being cut down., The roots no longer held the soil in place, so rain washed sediment into the river., How could the construction crew help prevent sediment from entering the river?, Remove more plants near the river, Leave plants or barriers near the river to hold soil in place, Add more muddy water to the river, Drill a new well beside the river, Which statement correctly describes the relationship between CFCs and the ozone layer?, CFCs are produced naturally by plants to protect the ozone layer., CFCs form the ozone layer in the upper atmosphere., CFCs damage the ozone layer by breaking down ozone molecules., CFCs help increase the amount of ozone in the atmosphere., What is air pollution?, The contamination of air by harmful substances, including gases and smoke, The formation of clouds from water vapor, The production of oxygen by plants, The natural movement of air in the atmosphere, What causes photochemical smog?, Water vapor reacting with dust, Nitrogen and carbon compounds reacting in sunlight, CFCs reacting with clouds, Ozone reacting with rainwater, Which human activity contributes most directly to photochemical smog?, Recycling paper, Using solar panels, Planting trees, Burning fossil fuels in vehicles and power plants, Which describes a way humans can decrease the amount of photochemical smog?, Increase the amount of particulate matter in the air, Pass laws to eliminate CFCs, Use sources of energy other than fossil fuels, Decrease the amount of ozone in the atmosphere, What is particulate matter?, A mixture of solid and liquid particles in the air, A gas that forms acid rain, A layer of ozone in the atmosphere, Water droplets found in clouds only, Which of the following is an example of particulate matter?, Water vapor only, Smoke, dust, and dirt, Oxygen, nitrogen, and carbon dioxide, Ozone and CFCs, Which of the following is a harmful effect of inhaling particulate matter?, Improved lung function, Increased oxygen production, Asthma, bronchitis, and heart attacks, Increased photosynthesis in plants, Which action helps protect Earth's atmosphere by reducing air pollution?, Turning off lights when they are not needed, Leaving lights on when leaving a room, Burning more trash, Using more fossil fuels, Which of the following is a positive action that helps reduce air pollution?, Driving more gasoline-powered vehicles, Increasing energy consumption, Cutting down forests, Planting trees, Which transportation choice can help reduce air pollution?, Using public transportation, Leaving vehicles idling, Driving alone in a car every day, Using older vehicles that burn more fuel, Which technology helps reduce the use of fossil fuels and protect the atmosphere?, Incinerators, Coal-burning power plants, Solar panels, Diesel generators, All of the following can help reduce air pollution EXCEPT:, Recycling materials, Increasing the use of fossil fuels, Using wind or geothermal energy, Riding bicycles

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