The dwindling supplies of rare strategic metals such as indium, tantalum, and platinum may be extended if we rigorously ________
A) relax environmental requirements for mining
B) increase demand for the products in which they are used
C) reduce demands for social and economic justice
D) recycle existing supplies
E) exploit known deposits more efficiently
D
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The polar jet stream is strongest in the winter when surface temperature contrasts are greatest
Indicate whether the statement is true or false
Geostrophic balance
A) is the balancing interaction of three forces. B) helps explain the direction of winds over North America. C) does not involve pressure gradient force. D) only happens when frictional forces are significant. E) all of the above
What is the gradient of a stream that drops 10 vertical feet over a 2-mile horizontal distance?
A. 20 feet per mile B. 10 feet per mile C. 2 feet per mile D. 5 feet per mile
The Hawaiian Island-Emperor Seamount chain formed as a result of ________
A) divergent plate boundary activities B) convergent plate boundary activities C) transform plate boundary activities D) hot spot activities