chapter 21
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Pollution | the presence of substances in the environment that are harmful to plants, animals, and humans
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| hazardous waste | trash that is harmful to humans and the environment
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| Where does hazardous waste come from? | 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? | pesticides pollute soil and water; CFC's destroy the ozone layer; PCB's are toxic
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| toxic | poisonous
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| radioactive wastes | takes hundreds or thousands of years to become harmless; cause cancer, lukemia, and defects
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| greenhouse effect | 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? | loud noise affects the ability to hear and think
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| renewable resource | a resource that can be used over and over again or that is unlimited in supply
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| nonrnewable resource | a resource that can only be used once; ex: oil
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| 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
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| overpopulation | 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 | variety of life or the many different species found in a particular habitat
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| deforestation | clearing of forest lands for lumber, nuts, rubber, paper,....
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| How do chemicals harm the environment? | pesticides pollute soil and water; CFC's destroy the ozone layer; PCB's are toxic
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| How are wetlands important? | 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? | Oil and plastics
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| biodegradable | things that are broken down by the environment
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| why do alien species thrive? | because they usually have no predators in the new environment
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| conservation | the wise use of and preservation of natural resources
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| The 3 R's of conservation | Reduce, Reuse, Recycle
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| 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
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| What are ways to reuse resources? | reuse water for lawns and plants *reusing items like clothing and rechargeable batteries
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| 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
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| resource recovery | the process of transforming garbage into electricity
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| 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
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| How can we maintain biodiversity? | *protect individual species *protect habitats
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| Endangered Species Act | *law forbids activities that might endanger a species on the list *requires development of programs to help endangered populations recover
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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