At the core of most environmental problems is this most fundamental problem:
a. air and water pollution
b. ozone depletion.
c. global warming.
d. overpopulation.
d
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Sometimes a cloud-to-ground lightning discharge appears to flicker. Which of the following statements explains why this happens?
A. You can distinguish separate return strokes. B. You observe entirely different strikes. C. You can observe the separate steps of the stepped leader. D. You blink because of the bright light.
The Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) regulates cleanup of Superfund designated hazardous waste sites and the siting, construction, and operation of hazardous waste sites.
Answer the following statement true (T) or false (F)
Which water mass is characterized by increasing density with deeper depths?
a. Surface zone b. Deep zone c. Pycnocline zone d. Mixed layer
Chemicals or forms of radiation that cause or increase the frequency of DNA mutations are called ____.
A. mutagens B. teratogens C. kerogens D. carcinogens E. neurogens