this is easy

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Across
  1. 2. these show the presence of energy [sound, light, temperature change (heat), motion of objects, and electrical energy]
  2. 4. the distance from one wave peak to the next,measured from peak to peak
  3. 5. when one form of energy changes to another; produces changes in indicators of energy
  4. 6. when two objects hit each other
  5. 8. the distance an object moves in a certain amount of time
  6. 10. (noun)–a way organisms receive information about their environments
Down
  1. 1. a device that transforms motion energy into electrical energy
  2. 3. the process by which energy moves from one part to other parts of a system
  3. 7. a group of objects that interact
  4. 9. something necessary to make things happen