SHW - Pg. 15

22. What happens in biological magnification?
- A trophic process in which retained substances become more concentrated with each link in the food chain.

23. What would be some of the properties of molecules that could be candidates for biological magnification?
- toxic materials, including synthetics which become even more toxic as they are converted to more toxic products by reaction with other substances or by the metabolism of microorganism.

24. What are possible reasons for global warming call the green house effect?
- Burning fossil fuels and wood; Increased productivity by vegetation is one consequence of increasing Carbon-dioxide levels; Rising atmospheric CO-2 levels may have an impact on Earth’s heat budget.

25. Is depletion of the ozone layer a possible reason for global warming?
- Yes, b/c the result of a reduction in the ozone layer may be increased levels of UV radiation that reach the surface of the Earth.


26. What is the cause for the depletion of the ozone layer? Why is it a problem?
- The destruction of ozone probably results from the accumulation of CFCs, or chlorofluorocarbons—chemicals used in refrigeration, as propellant in aerosol cans, and for certain manufacturing processes. The result of a reduction in the ozone layer may be increased levels of UV radiation that reach the surface of the Earth.

27. List several additional disruptive impacts humans have had on the environment.
- Endangered species, water contamination, and decreasing forests.