Water stored in a reservoir is used to generate electricity as it flows down into a river. The river flows into the ocean, where it evaporates to form clouds. Rain falls from the clouds into streams that flow into a reservoir.

Put the locations of the water in order from most potential energy to least potential energy. Assume the amount of water in each place is the same. These are the locations: 1. where it enters the river from the reservoir, 2. when it is in the ocean, 3. when it is in the reservoir, 4. when it is in the clouds.
Explain your reasoning for the order you chose.