A temperature inversion can adversely affect air quality and is characterized by ________
A) a layer of warm air forming above colder air
B) a layer of warm air forming above the stratosphere
C) a layer of cold air forming above warmer air
D) inverted air masses with particulates held at altitude
E) air masses in which primary and secondary air pollutants are inverted
A
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The original reactor built in 1942 was just "barely" critical because the natural uranium that was used contained less than 1% of the fissionable isotope U-235 (half-life 713 million years). What if, in 1942, the Earth had been 9 billion years old instead of 4.5 billion years old? Would this reactor have reached critical stage with natural uranium? Why?
A. No. The increased age of the Earth would mean that there would be a much smaller percentage of U-235, thus not enough for the reactor to reach critical stage. B. No. The age of the Earth has nothing to do with the reactor reaching critical stage with U-235. C. No. 1% of the fissionable isotope U-235 is insufficient for the reactor to reach critical stage no matter what the age of the Earth. D. Yes. If the Earth had been twice as old there would have then been twice as much fissionable U-235 present and the reactor would have reached critical stage.
the viewpoint that past processes are the same as the present ones which created our present land surface is known as ________.
a - volcanism b - uniformitarianism c - plate tectonics d - foliation e - diastrophism
Use the Venn diagram below for this question.
Which feature(s) are present at plate boundaries?
A. Stratovolcano B. Shield volcano C. Cinder Cone D. All of the choices are correct.
The sedimentary sequences that form on passive margins are predominantly ________.
A. sandstones B. andesitic flows C. limestone D. shale, limestone, and sandstones E. shale