SCIENCE

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Across
  1. 2. Positive ions are called
  2. 4. The layer of earth that protects the surface from harmful solar radiation
  3. 5. Small pieces of frozen rain
  4. 8. NH3
  5. 10. It is defined as mass divided by volume
  6. 12. Anything that has mass & volume
  7. 13. Unit of measurement of time
  8. 14. Blue litmus paper turns _______ under acidic conditions
  9. 15. Centre of atom is called ________
  10. 17. A process through which solid is separated from liquids
  11. 18. A process through which liquid changes to solid
  12. 19. Indivisible and single unit of matter
Down
  1. 1. Natural magnets are also called
  2. 3. Study of matter and the changes it undergoes
  3. 6. Strong base that dissolves in water
  4. 7. 70% of earth is made up of
  5. 9. First element in the periodic table
  6. 11. Earth is the 3rd planet from the ______
  7. 12. The only metal that is liquid in room temperature
  8. 16. Snow mixed with rain