Most thunderstorms do not extend very far into the stratosphere because the air in the stratosphere is?
a. ?unstable.
b. ?stable.
c. ?too cold.
d. ?too thin.
e. ?too dry.
ANSWER: b
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The Navajo Sandstone is a wind-blown sand deposit with large cross-beds. How would the sand of these ancient sedimentary rocks be characterized?
A)poorly sorted B)well-sorted C)compacted D)poorly graded E)cemented
The return period of a disaster is the average number of years ________.
A. required to exponentially decay to zero B. between same-sized events C. between events of the same type, regardless of size D. before survivors return to their homes E. before the economy returns to pre-disaster levels
Protective structures used to control mass-wasting include all of the following except
A. tunnels. B. terraces. C. retaining walls. D. a covering comprised of a heavy chain mesh.
If fishing demands continue at the current rate, by which year will the world's major fisheries collapse?
A. 2100 B. 2050 C. 2125 D. 2075