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Ch. 21 Environmental Problems and Solutions

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Across
5.the number and variety of org. in a certain habitat
11.another name for global warming
12.things that can catch fire, cause cancer or corrosion
13.government org. that helps protect the environment
16.once used in appliances and paint products
18.a natural resource that can be replaced at the same rate at which it is consumed
20.use less of the earth's resources
21.once used in aerosol cans, refrigerators, plastic production
22.designed to protect species that are on the verge of extinction against people hunting them or destroying their habitat.
23.too many organisms in an area for the resources available
Down
1.a natural resource that forms at a rate slower than it is consumed
2.pollution that comes from only one source
3.pollution comes from many different sources
4.able to be broken down by living organisms
6.using something again or re-purposing it
7.where something lives
8.this type of waste can mutate DNA
9.pollutant that affects the senses
10.the preservation and wise use of natural resources
14.non-native species that reproduce rapidly due to lack of predators.
15.an unwanted change in the environment that is caused by harmful substances
17.CO2 can contribute to this
19.recovery of materials from waste

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