Question

ocean and wind currents are both caused by ______.
a. uneven specific heat
b. the gulf stream
c. the jet stream
d. uneven insolation

Explanation:

Uneven insolation (uneven solar radiation) causes temperature differences on Earth's surface. These temperature differences drive air pressure differences, leading to wind currents. For ocean currents, uneven insolation - related temperature variations and wind (driven by uneven insolation) also influence them. Option A: Specific heat differences don't directly cause both. Option B: Gulf Stream is a specific ocean current, not a cause of both. Option C: Jet stream is a wind current, not a cause of both. So uneven insolation is the cause for both.

Answer:

D. uneven insolation