Final answer:
Hurricanes are the major storms that are driven primarily by the Coriolis effect.
Step-by-step explanation:
The type of major storm that is driven primarily by the Coriolis effect is called a hurricane. In the northern hemisphere, hurricanes rotate counterclockwise due to the Coriolis force, while in the southern hemisphere, they rotate clockwise. The Coriolis force is the deflection of objects, such as air, caused by Earth's rotation.