Ch 20- 8th grade

In a science fiction story, two countries are at war over the last remaining source of clean water because that source does not produce enough water to support all the people in both countries. What is the most basic problem?

• The population exceeded carrying capacity

• the people need to learn to negotiate better

• the population needs to grow in the smaller country

• the people should need less water

Human activities have which type of impact on the environment

• positive

• negative

• neither positive or negative

• both positive and negative

Reduced vegetation on Earth results in ---------

• more carbon dioxide in the atmosphere

• increased habitats

• less room for humans

• more oxygen in the atmosphere

Composting means piling up grass and leaves so they can be......

• collected with garbage

• collected separately from garbage

• allowed to gradually decompose

• used for cattle feed

About 30 to 50 percent of all species are found........

• on farms

• in the ocean

• on the prairie

• in rain forests

Which is most likely to have runoff that will upset the balance of nutrients in bodies of water?

• agriculture

• industry

• urban areas

• glaciers

Which of these substances can you pour down a drain without harming the environment?

• paint

• motor oil

• battery fluid

• white vinegar

Sulfur oxides and nitrogen oxides can combine with moisture in the air to form.....

• carbon dioxide

• acids

• sulfur dioxide

• photochemical smog

A cause of acid rain is ........

• the exhaust from cars

• emissions from coal-burning power plants

• moisture in the air

• all of these

A way for individual citizens to improve air quality is to ......

• reduce industrial pollution

• take more showers

• burn trash

• use public transportation