Energy

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Across
  1. 2. Operated by a machine or a machinery
  2. 4. Relating to chemistry, or the interactions of substances as studies in chemistry
  3. 6. Vibration that travels through the air or another medium and can be heard when they reach a person or animal's ear
  4. 7. The quality of being hot; high temperature
Down
  1. 1. Related to movement towards a center of gravity
  2. 3. Relating to or resulting from motion
  3. 5. The natural agent that stimulates sights and makes things invisible
  4. 6. Energy that comes from the sun