The source of electrons in the wires that charge your smart phone is
A. energy input.
B. the wires themselves.
C. the voltage source.
D. none of the above
Answer: B
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Which one of the following actions by scientists is least applicable to the field of environmental science?
A) Scientists determine the best fuel to generate electricity for a growing city in Arizona. B) Scientists help a rancher determine the best ways to rotate herds of cattle to reduce erosion. C) Scientists study X-ray emissions for evidence of black holes. D) Scientists at NASA launch satellites to monitor changes in carbon dioxide production on Earth.
Which of the following is a consequence of clearing forests for agriculture purposes?
A) Soil erosion is increased. B) Crop productivity is greatly increased because of the rich soil. C) CO2 levels remain appropriate within the atmosphere. D) Biodiversity is increased. E) Water runoff is decreased.
What type of map projection would be used if you wanted to accurately depict area?
a. equidistant b. equal area c. compromise d. conformal e. orientation
What is the basic problem or issue with respect to expanding the world's oil supply in the future?
A. all of the answers listed here B. numerous smaller fields must be found to offset production declines in older fields C. discoveries of new fields peaked in the 1970s D. fewer giant fields are being found today E. remaining deposits are more expensive and difficult to extract