In the United States, coal use has decreased in recent years.
Answer the following statement true (T) or false (F)
True
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Most sources of energy today are
A) fossil fuels. B) wind powered. C) based on coal and coal derivatives. D) from the developed world. E) renewable.
Why is 70% ethanol rather than 95% ethanol used in sterilizing skin before injections?
A) 70% ethanol kills bacteria by denaturing their surface proteins. B) 70% ethanol kills bacteria by penetrating them and coagulating their proteins. C) Special precautions must be taken when using 95% ethanol. D) None of the above is correct.
Which of the following federal laws deals with the clean-up of hazardous waste sites?
A. Toxic Substance Control Act (TSCA) B. Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) C. Resource Conservation and Recovery Act (RCRA) D. Hazardous Materials Transportation Act (HMTA)
Which of the following is not true?
a) the magnetic poles have reversed periodically in earth history b) magnetism is imparted to igneous rocks at the time of their formation c) virtually all rock types preserve some paleomagnetic signal d) magnetic field reversals occur about every 500,000 years e) there have been long periods of no magnetic field