SCIENCE

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