If a power plant is 30 percent efficient, and the transmission system that delivers power to consumers is 60 percent efficient, then the overall efficiency is
A) 90 percent.
B) 60 percent.
C) 30 percent.
D) 18 percent.
E) none of the above
D
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The lesson of Easter Island is that ________
A) we never comprehend resource issues until the resources are gone B) grassroots organizations must be involved to ensure sustainable societies C) economics is an important facilitator of sustainable societies D) conservation of resources is necessary for sustainable societies E) political and governmental support are required to ensure sustainable societies
Basalt and gabbro are compositional equivalents, which means that they are made up of the same
____________________ but have different ____________________. Fill in the blank(s) with the appropriate word(s).
________ are small, planetlike bodies.
A. Moons B. Comets C. Asteroids D. Meteors E. Planetesimals
Which of the following is a hazardous waste?
A) heavy metals B) PCB oils C) cyanides D) strong solvents E) All of these are hazardous wastes.