Of the following igneous rocks, which would have the lowest silica content?
a. rhyolite
b. granodiorite
c. andesite
d. gabbro
d
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What is the velocity of a stream with a cross sectional area of 300 m^2 and a discharge of 600 m^3/s?
A. 1 m/s B. 2 m/s C. 3 m/s D. 4 m/s
Which chemical family is composed almost entirely of man-made elements?
A) the actinides B) the lanthanides C) the halogens D) all of the above E) none of the above
For atmospheric radiation, ________ micrometer(s) is considered to be the boundary between "shortwaves" and "longwaves."
A) 1 B) 4 C) 10 D) 20 E) 50
Why does plutonium not occur in appreciable amounts in natural ore deposits?
A. Any plutonium initially in the earth's crust has long since decayed. B. Plutonium is strictly a human-made element. C. Most naturally occurring plutonium deposits have already been depleted in the creation of nuclear weapons. D. Plutonium loses electrons to form positively charged particles that have long since washed into the oceans.