Complete the statement. Assume that the horse's mass did not change.
The gravitational potential energy stored between the horse and Earth () as the horse ran toward the river.

 - increased
 - decreased
 - stayed the same
Think about how the distance between the horse and the center of Earth changed.
The bottom of the small hill is lower than the top of the hill. As the horse ran down the hill, the distance between the horse and the center of Earth decreased. So, the gravitational potential energy stored between the horse and Earth decreased as the horse ran toward the river.