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Science Ch. 4
Chapter 4: Living Resources: Test Monday:11-15-11
| Question | Answer |
|---|---|
| Why is fresh water scarce? | Fresh water is scarce because 97% of of the water on Earth is salt water. |
| Where do fresh water come from? | Fresh water mostly comes from the form of ice. |
| Why do water shortages occur? | Water shortages occur because the process of the water cycle do not produce enough water in useable form to meet humans needs. |
| When do water shortages become a problem? | They become a problem when drought occurs. |
| What wastes can end up in water? | Waste that end up in water are: households, industries, and mining. |
| What is a major pollutant from agriculture? | Pesticides. |
| What are some major pollutants from industry and mining? | Chemicals, metal wastes, heat oil, and gasoline. |
| Why is heat considered a pollutant? | Heat in considered a pollutant because heated water can kill living organisms in a body of water. |
| What does keeping water clean require? | Keeping water clean requires proper sewage treatment, the reduction of pollutants, and a effective cleanup of oil and gasoline spills. |
| What is most water pollution caused by? | water pollution is mostly caused by human activities. |
| What can industries can do to keep water clean? | To keep water clean they can reduce and recycle their waste. |
| What should you never dos with hazardous chemicals? | You should never pour them down the drain. |
| What happens if pollution reaches ground water? | It may be carried far away. |
| groundwater | water stored in underground layers if soil and rock. |
| pollutant | a substance that causes pollution. |
| sewage | the water human wastes that are washed down sinks, toilets, and showers. |
| pesticides | a chemical that kills crop-destroying organisms. |
| sediment | particles of rock and sand. |
| What is the major source of smog? | the major source is emmissions from vehicles. |
| What are the gases that are the source of smog? | hydrocarbons and nitrogen. |
| What does hydrocarbons and nitrogen react with? | They react with sunlight from the ozone layer which turns into smog. |
| When ozone is harmful when it is close to the Earth's surface. Ozone in the upper atmosphere filters________. | ultraviolet radiation. |
| What is acid rain caused by? | It caused by emmissions from some power plants and factories. |
| True or False: Some indoor pollutants only affect people who are sensitive to them. | True |
| What are some sources of indoor air pollution? | Some examples are dust, pet hair, glues, and cleaning supplies. |
| When does carbon monoxide form? | Co2 forms when wood, coal, or gas are incompletely burned. |
| What is the major cause of the ozone hole? | The major cause is a group called CFC's or chlorofluorocarbons. |
| How can radon enter homes? | Radon can enter homes by they enter through cracks in basement floors and walls. |
| Why is carbon monoxide hard to detect? | It is hard to detect because it is colorless and odorless. |
| What is the key to reducing air pollution? | The key is to control emissions. |
| pollution | control devices such as a catalytic converter control emissions from cars and trucks. |
| emissions | pollutants that are released into the air. |
| photochemical smog | a thick, brownish haze formed when certain gases react with sunlight. |
| ozone | a toxic form of oxygen |
| temperature inversion | a condition in which layers of warm air traps polluted air close to the Earth's surface. |
Created by:
kkrause
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