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Runk's Science 1
chapter 21
| Question | Answer |
|---|---|
| Pollution | the presence of substances in the environment that are harmful to plants, animals, and humans |
| hazardous waste | trash that is harmful to humans and the environment |
| Where does hazardous waste come from? | industries (paper mills, nuclear power plants, oil refineries), hostipals and laboratories, homes (old cars, paint, batteries) |
| How do chemicals harm the environment? | pesticides pollute soil and water; CFC's destroy the ozone layer; PCB's are toxic |
| toxic | poisonous |
| radioactive wastes | takes hundreds or thousands of years to become harmless; cause cancer, lukemia, and defects |
| greenhouse effect | carbon dioxide and pollutants act like a greenhouse around the earth; temps rise and polar ice caps melt |
| Why is noise considered pollution? | loud noise affects the ability to hear and think |
| renewable resource | a resource that can be used over and over again or that is unlimited in supply |
| nonrnewable resource | a resource that can only be used once; ex: oil |
| alien species | 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 |
| overpopulation | when the number of individuals becomes so large that they cannot get the food, water, and resource they need on an ongoing basis |
| biodiversity | variety of life or the many different species found in a particular habitat |
| deforestation | clearing of forest lands for lumber, nuts, rubber, paper,.... |
| How do chemicals harm the environment? | pesticides pollute soil and water; CFC's destroy the ozone layer; PCB's are toxic |
| How are wetlands important? | help control flooding, filter pollution, and provide breeding grounds; often drained for farmland, homes, shopping malls,... |
| What are 2 reasons for marine habtat loss? | Oil and plastics |
| biodegradable | things that are broken down by the environment |
| why do alien species thrive? | because they usually have no predators in the new environment |
| conservation | the wise use of and preservation of natural resources |
| The 3 R's of conservation | Reduce, Reuse, Recycle |
| What are ways to reduce pollution and waste? | *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 |
| What are ways to reuse resources? | reuse water for lawns and plants *reusing items like clothing and rechargeable batteries |
| What are ways we can recycle? | *plastics, glass, aluminum, wood and cardboard can be recycled to make new products *waste can be burned to make electricity |
| resource recovery | the process of transforming garbage into electricity |
| Why is biodiversity important? | *if a disease affects one type of tree, it won't wipe out the whole forest *each species makes an important contribution |
| How can we maintain biodiversity? | *protect individual species *protect habitats |
| Endangered Species Act | *law forbids activities that might endanger a species on the list *requires development of programs to help endangered populations recover |
Created by:
weavergina
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