Puzzle 84

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Across
  1. 5. The islands extensively studied by Charles Darwin.
  2. 7. Units of electric power.
  3. 8. The 'R' in NMR.
  4. 11. The most common element in pure water.
  5. 13. The change of state from gas to liquid.
  6. 14. The study of materials at very low temperatures.
  7. 15. The units of electric resistance.
  8. 16. Molten rock before it has erupted.
  9. 17. Substances that don’t conduct heat.
  10. 18. The device used to measure electric current.
  11. 19. The instrument used to accurately measure small amounts of liquid.
Down
  1. 1. A person who studies fossils and prehistoric life.
  2. 2. The 'E' in EMP.
  3. 3. A planet circled by two moons.
  4. 4. The lens used in a magnifying glass.
  5. 6. The 'D' in LED.
  6. 9. The gas essential in the production of fertilizers and light bulbs.
  7. 10. A single piece of coiled DNA.
  8. 12. The wire inside an electric bulb.
  9. 14. One of the three-time periods of the dinosaurs.