Question

what happens when you drop a rock in a puddle?
it creates a disturbance called an electromagnetic wave.
it creates a disturbance of energy called a wave.
it does not create a wave.
it creates a medium.

Explanation:

When a rock is dropped in a puddle, it disturbs the water (a medium). Waves are disturbances of energy. An electromagnetic wave is a type of wave that doesn't require a medium like water (e.g., light). A medium (like water) already exists; the rock doesn't create it. And clearly, dropping a rock does create a wave (ripples) in the puddle.

Answer:

It creates a disturbance of energy called a wave.