Unequal heating of Earth 's surface by the Sun causes global wind patterns, and winds of 74 mph are the standard for a hurricane. Given these facts, what forms due to unequal heating of Earth's surface by the Sun among the following options:
- rays or beams
 - hurricanes
 - power stations
 - It expands
 - climate
 - The atmosphere
 - an object
 - energy barrier


 

  hurricanes       