Energy exists in many forms. Most of the energy that is available to make change occur in the watershed comes to earth in the form of sunlight. Energy is not created or destroyed within the watershed, but may be changed in form. Kinetic energy is the energy of motion. Potential energy is stored energy.
Energy is transferred from one body to another when work is done.
C. Kinetic Theory explains many of the macroscopic changes observed in samples of matter in terms of the motion of the particles making up the sample. The properties of water are the result of the interactions of water mulecules with one another and with other mulecules in the environment. Increasing or decreasing the temperature of a sample of matter means that the particles in the sample are moving faster or slower. Changing the energy of a sample of matter may result in a change of state such as melting, boiling, condensing, or freezing. The different states of matter have characteristics that are determined by the arrangement and interactions of the particles.