Acalm pond has energy while a water fall has energy

•kinetic
•nuclear
•potential

1. Potential

2. Kinetic

Explanation:

The potential energy is the energy which remains stored inside the static object or any other entity, due to arrangement, position or state of the object or entity. The kinetic energy of an object or entity is the energy that produces due to the motion of the object or entity.  

On the basis of the above explanation, this can be said that when a pond remains calm or static, it exhibit energy in the stored form that is the potential energy as water inside it does not flow in high speed. While a water fall has energy in the form of kinetic energy. As the water in the water fall is likely to flow with high speed.

observation 4

Explanation:

because it contains