paragraph: In many parts of the world, trees lose their leaves in autumn. The leaves turn color. Then fall from the trees to the ground. As the leaves are falling, they have kinetic energy. While they are still attached to the trees they also have energy. When they are attached they are not in motion, so how can they have energy? Instead of kinetic energy, they have stored energy. This stored energy is called potential energy. An object has potential energy because of its position. For example, leaves on trees have potential energy because they could fall. They fall because of the pull of gravity. Potential energy can be transferred into motion. Motion can also be turned back into potential energy. Objects have potential energy due to their position. A leaf on a tree branch has potential energy. The leafs energy can be turned into motion as it falls. Once the leaf is on the ground, it has no more potential unless it is lifted back up. 
question: What kind of energy do leaves have while still on the trees?
answer: Stored energy