Select all the primary causes of surface currents in the oceans.
A. wind
B. gravity
C. Earth's rotation
D. extreme weather
E. density differences
F. uneven heating of oceans
Which of the following is an important effect of ocean gyres?
A. moderation of Earth's climate
B. unequal distribution of water on Earth
C. transportation of goods across the oceans
D. isolation of marine species into different ecosystems
Deep ocean water from the North Arctic region warms and rises back to the surface again in the _________.
A. Indian Ocean
B. Southern Ocean
C. North Atlantic Ocean
D. South Atlantic Ocean