In order for the social changes to occur that will produce sustainable economies, fully 50% of the population of a country must support the change
Indicate whether the statement is true or false
F
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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 age of the Earth has nothing to do with the reactor reaching critical stage with U-235. B) 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. C) 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. D) 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.
Dairy cow regions of the United States are not farmed because they are covered by eolian soils. Indicate whether the statement is true or false
Where was the first large-scale commercial geothermal electrical facility in the United States, built in 1960?
A) The Geysers, California B) Oak Ridge, Tennessee C) Hot Springs, Arkansas D) Mammoth Lake, California
Salt is a weak rock that can flow and therefore it forms
A. slip plane fold thrust faults. B. salt glaciers. C. domes. D. All of these choices are correct.