You are presented with the quiz "What forms due to unequal heating of Earth's surface by the Sun?" 

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 "winds of 74 mph are the standard for a hurricane". 

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


 

  hurricanes         