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Chapter 6 Humans in the Biosphere

Dr. J

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Across
2.the sum total of all the different forms of genetic
5.when many new techniques began to be used to increase
7.the sum total of the genetically based variety of all
8.a mixture of chemicals causing the air to appear dirty
9.an area in the atmosphere containing high concentrations of
10.these won't regenerate or replace themselves
12.precipitation with a low pH
16.the wearing away of surface soil by wind and water
18.the number of different species in the biosphere
19.when an ecosystem is fragmented by development
21.to use resources without depleting them and
22.resources biotic or abiotic that can regenerate given
23.when a species disappears from all or part of its range
24.the spread of deserts caused by overgrazing or drought
25.large fields are planted with a single variety of plant year
Down
1.when concentrations of harmful substances
3.when a species population is in serious decline
4.they are introduced into an area where they don't
6.an unnatural harmful material found in the air or water or
11.the wise management of natural resources
13.when trees are removed from a wide area and not replaced
14.the variety of habitats, communities and ecological
15.an increased average temperature in the atmosphere
17.raising animals in water for human consumption
20.the practice of farming

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