Fossil fuels are considered nonrenewable sources of energy because ________
A) people are cutting down too many forests to allow trees to turn into coal
B) they release carbon dioxide when they are burned
C) carbon dioxide levels in the atmosphere are too high to allow fossil fuels to form
D) they are used more quickly than they can naturally be replaced
D
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Which of these clouds produces substantial precipitation?
A) altostratus B) cirrostratus C) cumulus D) nimbostratus E) none of the above
R = reactants P = productsGiven that the above energy profiles have the same scale, which of the reactions is the most exothermic?
A. a B. b C. c D. d E. none of the above
Which of the following gives the correct order of pressures?
A) arterial > osmotic blood pressure > venous B) arterial > venous > osmotic blood pressure C) osmotic > blood pressure > arterial > venous D) venous > osmotic blood pressure > venous
During the Industrial Revolution in the United States, all of the following cities were important, EXCEPT
A) New York. B) Boston. C) Philadelphia. D) Baltimore. E) St. Louis.