A high tide is occurring at Charleston, South Carolina (80°W, 33°N). What two longitudes are experiencing low tide?
A) 10°E and 170°E
B) 10°W and 170°W
C) 10°E and 170°W
D) 10°W and 170°E

Question

Quizplus · Accepted Answer

Tides are primarily caused by the gravitational pull of the moon. When high tide occurs at a certain longitude, low tide occurs approximately 90 degrees to the east and west of that point. Charleston, South Carolina, is at 80°W, so adding and subtracting 90 degrees gives us 10°E and 170°W as the longitudes experiencing low tide.

A High Tide Is Occurring at Charleston, South Carolina (80°W