Tidal power can be harnessed by __________
a) trapping water behind coastal barriers in bays and estuaries
b) placing floating buoys with pivoting turbines in them to capture the currents
c) allowing tidal currents to pass through narrow channels to turn turbines
d) A, B, and C
e) Only A and C
E
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One suggested cause of deep focus earthquakes is ________.
A. collapse of minerals into denser forms B. the rise of core material into the mantle C. friction between the core and the mantle D. collision of convection currents E. collapse of pore space in sedimentary rocks
Which of the following is a ring-shaped island of coral?
a. Fringing reef b. Barrier reef
c. Drumlin d. Mangrove e. Atoll
The Three Gorges Dam has been constructed on the Yangtze River
Indicate whether the statement is true or false
The settlement of North America by Europeans took place in how many stages?
A) one
B) two
C) three
D) four
E) five