Natural Science Crossword Puzzle

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Across
  1. 1. The ____ is the unit used to measure energy
  2. 5. The transfer of heat energy by electromagnetic waves
  3. 6. Potential energy can change to _____ energy
  4. 10. An energy source derived from living matter
  5. 12. The transfer of heat energy in fluids, (liquids and gases)
  6. 14. A book held up above the ground has ___ potential energy
  7. 16. An energy drink has ____ potential energy
  8. 17. A non-renewable energy source
Down
  1. 2. A radioactive metal used in nuclear power stations
  2. 3. An energy flow diagram has an input, a ______ and an output
  3. 4. The transfer of heat energy between two objects in direct contact with each other
  4. 7. A stretched elastic band has ____ potential energy
  5. 8. A bicycle is an example of a _____ system
  6. 9. The variable that is deliberately changed by the investigator in an experiment
  7. 10. A cow eating grass is an example of a ___ system
  8. 11. South Africa's only nuclear power station
  9. 13. A TV is an example of an ___ system
  10. 15. Energy from falling water