What percentage of our commercial energy mix comes from wind energy?
A. <1%
B. 5%
C. 7%
D. >23%
Answer: A
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What is the largest climate modifier in the southern hemisphere?
A) the amount of temperature gradient between the south pole and the equator B) the lack of deserts and dry areas in the southern hemisphere C) the fact that a very large portion of the southern hemisphere's surface area is composed of water D) The jet streams are not as strong and more zonal in the southern hemisphere.
The densities of the coinage metals (copper, silver and gold) are as follows: copper = 8.95 g/cm3 silver = 12.59 g/cm3 gold = 19.32 g/cm3 A sample of material is found to weigh 14.03 grams, and have a volume of 1.20 cm3. The sample could be which of the coinage metals?
A) copper B) silver C) gold
Why are inlets through barrier bars or barrier islands not closed by longshore drift of sand?
a. Such inlets are always the outlets for onshore rivers to reach the sea, so they flush the sand out. b. Rapid flow of water back and forth through the inlet as tides rise and fall keeps it clear. c. Longshore sand drifted into such inlets drops into deeper water, so it drifts out to sea. d. Sand drifted into such inlets encounters brackish water from the inlet and dissolves. e. Sand drifted into such inlets is carried into the lagoon by incoming waves.
To which of the following languages is Manchu the most closely related?
A) Mandarin Chinese B) Cantonese C) the tribal languages of central and southeastern Siberia D) the tribal languages of central Tibet E) Korean