Science Day crossword puzzle - Prelims

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Across
  1. 3. Most radioactive element
  2. 5. Positively charged particles
  3. 8. Pluto is known as the _____ Planet
  4. 9. Usually, a tool with a _______ tip is used to cut glass
  5. 11. Term used to describe an object whose shape reduces drag/allows it to move easier through air while moving forward
  6. 12. Largest natural source of freshwater
  7. 15. Outermost later of the earth
Down
  1. 1. Hydrogen engines use water as fuel source in cars.
  2. 2. The Earth's ____ affects the tides of the water bodies
  3. 4. Back side of mirrors are usually coated with :
  4. 5. Fourth state of matter
  5. 6. strongest muscle in the human body
  6. 7. The massive explosion of a massive dtar
  7. 10. What can never be destroyed and never be created
  8. 13. Element whose symbol is "Cu"
  9. 14. Saturn's largest moon