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MB 9b
Test Description: Currents
Instructions: Answer all questions to get your test result.
1) The primary force that provides energy for surface currents are
A
wind
B
coriolis effect
C
gyres
D
ekman transport
2) Circular flow in each ocean basin is call a gyre
A
true
B
false
3) there are ___ gyres found in ____
A
two, polar regions
B
two, equatorial regions
C
five, in each major ocean basin
D
five, the North Atlantic
4) Gyres are called ________ currents, they tend to flow
A
equatorial, clockwise in North hemisphere, counter clockwise in Southern Hemisphere
B
geostrophic, clockwise
C
equatorial, quickly
D
geostrophic, clockwise in North hemisphere, counter clockwise in Southern Hemisphere
5) Currents tend to flow around the periphery of an ocean basin because
A
of the elevated surfaces level in the center and the Coriolis effect
B
the edge of the basin is deeper
6) Western boundary currents flow more quickly than eastern boundary currents partly becuase the trade winds pile water on the western ocean boundary
A
true
B
false
7) Although different water layers move in different directions in an Ekman spiral, the overall effect of Ekman transport is to move a currently directly in line with the wind
A
true
B
false
8) A counter current runs _________ an adjacent current. It is thought to be formed by water ____________ a basin faster than it ____________
A
beneath, the same as, counter current
B
beneath, entering, evaporating
C
opposite to, entering, exits
D
beneath, exiting, evaporating
9) An undercurrent runs _____________ an adjacent current. The reason why it forms is _________
A
beneath, the same as for a counter current
B
perpendicular to, unclear
C
beneath, unclear
D
perpindicular to, the same as for a counter current
10) both upwellings and downwellings can result from a wind parallel to the shore
A
true
B
false
*select an answer for all questions
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