Chapter 21 Example Questions Test Answers – Flashcards
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quantity is weight what is the unit,, symbol, and instrument
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newton, N, and spring scale
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Pollution
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the presence of substances in the environment that are harmful to plants, animals, and humans
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hazardous waste
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trash that is harmful to humans and the environment
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Where does hazardous waste come from?
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industries (paper mills, nuclear power plants, oil refineries), hostipals and laboratories, homes (old cars, paint, batteries)
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How do chemicals harm the environment?
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pesticides pollute soil and water; CFC's destroy the ozone layer; PCB's are toxic
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toxic
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poisonous
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radioactive wastes
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takes hundreds or thousands of years to become harmless; cause cancer, lukemia, and defects
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greenhouse effect
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carbon dioxide and pollutants act like a greenhouse around the earth; temps rise and polar ice caps melt
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Why is noise considered pollution?
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loud noise affects the ability to hear and think
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renewable resource
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a resource that can be used over and over again or that is unlimited in supply
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nonrnewable resource
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a resource that can only be used once; ex: oil
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alien species
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an organism that is carried to a new place by humans and thrives; can become a pest and drive out native species; ex: zebra mussel, purple loosestrife
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overpopulation
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when the number of individuals becomes so large that they cannot get the food, water, and resource they need on an ongoing basis
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biodiversity
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variety of life or the many different species found in a particular habitat
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deforestation
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clearing of forest lands for lumber, nuts, rubber, paper,....
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How do chemicals harm the environment?
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pesticides pollute soil and water; CFC's destroy the ozone layer; PCB's are toxic
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How are wetlands important?
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help control flooding, filter pollution, and provide breeding grounds; often drained for farmland, homes, shopping malls,...
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What are 2 reasons for marine habtat loss?
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Oil and plastics
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biodegradable
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things that are broken down by the environment
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why do alien species thrive?
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because they usually have no predators in the new environment
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conservation
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the wise use of and preservation of natural resources
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The 3 R's of conservation
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Reduce, Reuse, Recycle
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What are ways to reduce pollution and waste?
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*products are wrapped in less plastic and paper *choose to not take your purchases in a paper or plastic sack *creating biodegradable plastics *not using chemicals in farming *alternative sources of energy like wind and solar
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What are ways to reuse resources?
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reuse water for lawns and plants *reusing items like clothing and rechargeable batteries
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What are ways we can recycle?
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*plastics, glass, aluminum, wood and cardboard can be recycled to make new products *waste can be burned to make electricity
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resource recovery
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the process of transforming garbage into electricity
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Why is biodiversity important?
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*if a disease affects one type of tree, it won't wipe out the whole forest *each species makes an important contribution
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How can we maintain biodiversity?
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*protect individual species *protect habitats
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Endangered Species Act
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*law forbids activities that might endanger a species on the list *requires development of programs to help endangered populations recover
