Unit 7 Questions and Concepts to Study

7.1 Measuring currents

(1) surface currents vs deep currents:

• what causes them?

(2) measuring surface currents

• is it easy or difficult to measure surface currents? why?

7.2 What creates ocean surface currents and how are they organized?

• where do surface currents occur in the ocean?

• what are surface currents affected by?

• how do surface currents develop?

• what are the 5 subtropical gyres of the world?

• what direction do the subtropical gyres rotate in the northern hemisphere? in the southern hemisphere?