Nuclear fusion reactions
A) were used in the atomic bombs dropped on Japan in 1945.
B) require conditions that are not yet cost-efficient for the generation of electricity.
C) are widely used today in nuclear power plants.
D) can only occur in the special conditions of the sun and stars.
B
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What principle states that in an undisturbed succession of sedimentary rocks, the oldest layer is at the bottom and the youngest is at the top?
A)The principle of cross-cutting relationships B)The principle of inclusions C)The principle of fossil succession D)The principle of uniformitarianism E)The principle of superposition
A crevasse stops in a glacier at a depth
A) equal to the crustal boundary. B) where plastic deformation occurs. C) of 50 meters. D) located at the rock or regolith below the glacier.
If you push an object with twice the work input for twice the time, your power input is
A) twice as much. B) four times as much. C) the same amount as for half the work in half the time.
One problem with the ____________________ is that chemicals would require thorough toxicity screening, making it very expensive to introduce any new chemicals into society.
Fill in the blank(s) with the appropriate word(s).