Final answer:
Hydroplaning occurs when a car's tires ride on top of water on the road's surface, leading to a loss of traction and potential loss of control.
Step-by-step explanation:
Hydroplaning occurs when the tires of a car ride on a layer of water on the road's surface, leading to a loss of traction. When this happens, the tires are no longer in contact with the road, and the driver may lose control of the vehicle. Hydroplaning is caused by a combination of factors including the depth of water on the road, the speed of the vehicle, and the condition of the tires.