Describe what happens when the rock on the top of a hill is pushed.

The precise point is that gravitational energy is potential energy unless it makes something move, and then the energy is converted to kinetic energy, no work can be done. So a big rock at the top of a hill has no kinetic energy. Its only when it rolls down that work is done, and this can be converted to useful energy.

Explanation:

in this image, you can see solar radiation going through ocean water.

no image, but probably absorption