A rock may be subjected to either mechanical or chemical weathering, but never both at the same time. Indicate whether the statement is true or false
F
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What percent of the world's total species could be extinct by 2050?
A) 25% B) 50% C) 35% D) 95% E) 5%
Which of the following lessons was illustrated by flood data from the Colorado River and from the Yellowstone River?
A) Fifty years is a long enough record to record all but a 100-year flood. B) The largest flood possible along a river is likely to have been witnessed by humans. C) Few floods are ever larger than 10,000 cubic meters per second. D) None of these are correct.
Generally, if the settlement hierarchy does not graph as a straight line, then the society does not have:
A) an urbanized enough population B) a rank-size distribution of settlements C) enough cities for the people to have a good standard of living D) any problems with crime and homelessness E) a migration problem
The name of the current that flows from north to south along the west coast of North America is the California current
Indicate whether the statement is true or false