When a dam and reservoir are constructed, the natural response of the river and its channel gradient come under the control of
A) the same base level that existed prior to construction.
B) those of the closest nearby natural lake.
C) the government.
D) a local, or temporary, base level.
E) an ultimate base level.
D
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Distribution of temperature during the year:
What term refers to a combination of related parts that interact in an organized manner?
a. system b. hypothesis c. theory d. uniformitarianism e. scientific method
Precipitation of calcium carbonate in caverns can create:
a. springs. b. uvalas. c. sinkholes. d. stalactites. e. disappearing streams.
Because prairie dogs have a major effect on the ecological functioning of their habitat and the health of other members of their community, they are considered to be
A. an indicator species. B. a flagship species. C. a keystone species. D. an umbrella species.