Question

if you throw a rock into a still pond, a wave travels to the edge. which statement best explains what happens to the water molecules in the middle of the pond? the water molecules vibrate but stay in roughly the same place. the water molecules are converted into energy by the disturbance. the water molecules are destroyed by the energy of the wave. the water molecules travel with the wave to the edge of the pond.

Explanation:

When a wave travels through water (like in a pond), it is a mechanical wave. In a mechanical wave, the medium (water molecules here) vibrates about their mean position but does not move along with the wave. Energy is transferred by the wave, but the molecules themselves do not get converted into energy (matter - energy conversion is not relevant here in this simple wave - water molecule interaction), nor are they destroyed. The key concept is that in a wave (except for some special cases like a tsunami which has more complex behavior due to its large - scale nature), the molecules of the medium (water) oscillate around their original positions.

Answer:

The water molecules vibrate but stay in roughly the same place.