1).pollutants dumped into the rivers and streams eventually find their way to
(a.the ocean b.the atmosphere c.groundwaters supplies).
2).the average tempereture of the earths atmosphere may rise as a result of
(.the green house effect b.water pollution c.garbage dumping).
3).many(a.non-renewable b.alternative c.expensive)energy sources are being developed to replace fossil fuels.
4).some endangered species of plant in tropical rain forests may be sources of
(a.fossil fuel b.medicine c.hazardous waste)
5).humans are using (a.fewer b.better c.more)natural resources than they did 100 years ago?

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