* The greatest danger facing most endangered species is...
* Which of the following is not listed as an endangered species under the U.S. Endangered Species Act?
* The Bronx Zoo once had a picture frame covered by cloth. It was labelled 'The most dangerous species in the world'. If you removed the cover, you saw...
* Which of the following substances is not biodegradable?
* What environmental problem is the result of chemical reactions in the atmosphere that involve sulfur?
* What chemicals have been banned in most of the world because of their role in destroying the ozone layer?
* Who wrote 'Silent Spring', the first book documenting many of the problems caused by pesticides?
* Which of the following is not a renewable resource?
* Which of the following practices produces the most organic water pollution?
* 'Ecology' comes from two Greek words meaning...
* These propellants usually found in aerosol cans are thought to be harmful to the ozone layer.
* Speaking of the ozone layer, what harmful product does this part of the atmosphere filter?
* What is the result when industrial chemicals combine with condensing water vapor?
* What California city is generally considered to have America's worst air pollution problem?
* What is visible air pollution called?
* What is the main source of water pollution in unindustrialized nations?
* What oil tanker created a major water problem around Alaska?
* The evaporation of irrigation water leaves salt in soil producing what type of soil pollution?
* What animal of the Brazilian rainforest was discovered in the last 20 years?
* When a piece of rainforest is bulldozed, what do people put in its place?