Which of the following materials probably has the lowest porosity?
A. sand with well-rounded grains
B. well sorted, coarse-grained sediment
C. well sorted, fine-grained sediment
D. unfractured granite
Answer: D
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Air flows from ____________________ pressure regions to ____________________ pressure
regions. Fill in the blank(s) with the appropriate word(s).
The single largest source of air pollutants is highway vehicles
Indicate whether the statement is true or false
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 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) It is not possible to stop or control a chain reaction once it has been started. E) A chain reaction will only take place when a critical mass of material has been assembled.
What type of soils are present in wetlands?
A. hydric B. hydrologic C. hydrophytic