Which substance is one of the top five toxic substances in terms of human and environmental health?

A. lead
B. formaldehyde
C. tobacco smoke
D. DDT
E. nitrous acid


Answer: A

Environmental & Atmospheric Sciences

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Oil and natural gas originate from ________ in marine sediments.

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The soils in the central part of the United States used for growing wheat, corn and soybeans are classified as ________ soils

A) forest B) rainforest C) grassland D) desert E) wetland

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Which of the following are health problems that can be caused by ozone?

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Environmental & Atmospheric Sciences