The main feature shown in this photograph illustrates
A) weathering.
B) flooding.
C) permafrost.
D) slope failure.
D) slope failure.
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How do marine reptiles and seabirds deal with the salinity of seawater?
A) They have special glands that help excrete salt. B) They dilute the salt with freshwater. C) Their bodily fluids are saline, as well. D) They have a filter in their throats that removes salt.
Poisonous volcanic gasses can contaminate drinking water
a. True b. False
Time-space convergence is defined as
A) the reduction in the cost of travel and travel time among places. B) friction of distance. C) distance decay. D) the reduction in the travel costs between places as a result of transport improvements. E) none of the above
Which of the following reagents can be used to reduce a carboxylic acid?
A) sodium borohydride B) lithium aluminum hydride C) both a and b D) neither a nor b