The difference between the wilting point and field capacity is approximately equal to
A) wilting point water.
B) gravitational water.
C) available water.
D) hygroscopic water.
C
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Compared to the mass of an electron, the mass of a proton is
A. very much less. B. identical. C. very much greater. D. greater.
The determination that a granite pluton is not intrusive into overlying sedimentary layers because there are pebbles of granite in the bottom-most layer is an application of the Principle of
A) Superposition. B) Inclusions. C) Cross-cutting relationships. D) Original Horizontality.
The Canadian province of Alberta has the world's largest commercially developed deposit of which fossil fuel?
A) Anthracite coal B) Natural gas C) Petroleum D) Tar sands
Which of the following statements about chain reactions is true?
A. The key requirement for a chain reaction is that more neutrons are produced than that are absorbed. B. Three or more neutrons must be released to sustain a chain reaction. C. Only uranium isotopes are capable of supporting a chain reaction. D. A chain reaction will only take place when a critical mass of material has been assembled. E. It is not possible to stop or control a chain reaction once it has been started.