Question at position 19 The large ocean surface-current gyres centered on about 30°N _________.do not rotaterotate clockwiserotate counterclockwise单项选择题
A
do not rotate
B
rotate clockwise
C
rotate counterclockwise

Question

Question at position 19 The large ocean surface-current gyres centered on about 30°N _________.do not rotaterotate clockwiserotate counterclockwise

BlackTom AI · Accepted Answer

The question asks about the rotation direction of the large ocean surface-current gyres centered near 30°N.
Option A: 'do not rotate' — This would imply no rotational motion, which contradicts the well-established pattern of large-scale gyres that circulate due to Coriolis forces. Therefore this choice is incorrect.
Option B: 'rotate clockwise' — In the Northern Hemisphere, the Coriolis effect deflects moving water to the right, producing a clockwise circulation in subtropical gyres centered around 30°N. This aligns with observed oceanic circulation patterns, making this option correct.
Option C: 'rotate counterclockwise' — A counterclockwise rotation is characteristic of gyres in the Southern Hemisphere (and in certain limited contexts) but not of the Northern Hemisphere subtropical gyres at ~30°N. This makes this choice inaccurate for the given location.
"rotate clockwise" is consistent with the general hemispheric pattern of large-scale basin gyres, where wind forcing interacts with Earth’s rotation to drive a clockwise flow in the Northern Hemisphere subtropics, forming the large circular gyre systems.

Question at position 19 The large ocean surface-current gyres centered on about 30°N _________.do not rotaterotate clockwiserotate counterclockwise单项选择题

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