The Andes formed as result of oceanic-continental convergence. Indicate whether the statement is
Indicate whether the statement is true or false.
T
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When the remains of an organism dissolve and leave a cavity, the resulting structure is called
a/an _______. Fill in the blank(s) with the appropriate word(s).
The lesson of Easter Island was that ________
A) we never comprehend resource issues until the resources are gone B) economics is an important facilitator of sustainable societies C) conservation of resources is necessary for sustainable societies D) political and governmental support are required to ensure sustainable societies E) grassroots organizations must be involved to ensure sustainable societies
Which of the following is true regarding dawn and twilight?
A) Dawn and twilight last longest at the equator—approximately 2.5 hours. B) The polar regions do not experience dawn and twilight. C) 60° north and south latitudes receive the most dawn and twilight. D) The duration of both increases with increasing latitude.
Wing dams are used to constrict river channels to increase river depth for barge traffic during low flow
a. True b. False