Energy

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Across
  1. 5. The heat from the Earth
  2. 9. energy from a source that is not depleted when used
  3. 10. the total energy of an isolated system in a given frame of reference remains constant
  4. 12. the sum of kinetic and potential energy in an object that is used to do work
Down
  1. 1. Energy that a body possesses by virtue of being in motion
  2. 2. form of hydropower that converts the energy obtained from tides into useful forms of power
  3. 3. the change of energy from one form to another
  4. 4. Flowing water creates energy that can be captured and turned into electricity
  5. 6. the energy possessed by a body by virtue of its position relative to others
  6. 7. sources that will run out or will not be replenished in our lifetimes
  7. 8. radiant energy emitted by the sun
  8. 11. The strength and vitality required for sustained physical or mental activity