You are presented with the quiz "What causes the westerlies?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "unequal heating of Earth 's surface by the Sun causes global wind patterns" and "wind belts in the Atlantic Ocean include the trade winds and the prevailing westerlies ". 

So, what's the best answer to the question?


 

       Uneven heating by the sun    