Which of the following is not a source of deep water in the ocean?
A) Southern subpolar latitudes
B) Northern subpolar latitudes
C) Subtropical convergences
D) Arctic convergence
E) Antarctic convergence
C
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Phytoplankton productivity has dropped by 9% in the last 20 years
Indicate whether the statement is true or false
In Glacial topography, a Cirque is:
a. A tributary valley whose floor is at a higher level than that of the main valley b. A bowl-shaped depression that forms at the upper end of glacial troughs c. A thin ridge formed by the headward erosion of two cirques (on opposite sides of a ridge) d. A steep-walled pyramidal peak
Which revolutions relied most heavily on fossil fuels?
A) The Medical Revolution and Industrial Revolution B) The Environmental Revolution and Medical Revolution C) The Green Revolution and Industrial Revolution D) The Neolithic Revolution and Environmental Revolution
In a standing wave, the positions where there is maximum vertical motion are called ________.
A. troughs B. wave gaps C. nodes D. surges E. antinodes