Across
- 3. Obtained from plants to make paper
- 4. _________ of salinity in sea water
- 6. Solid to gas
- 10. Symbol of lead
- 11. Harmful substances in water
- 13. Total number of elements known
- 15. Method used to separate pebbles from fine sand
- 16. __________% of freshwater on earth
- 18. Forms the basis of many synthetic fibres
- 19. Also known as parametal
- 21. Type of chemists
Down
- 1. Earth is often referred to as _____
- 2. Carbon atomic number
- 5. Example of pesticide
- 7. Contains penicillin and tetracycline
- 8. An irregular and random motion of gas and liquid molecules
- 9. Used in temperature checking
- 12. Proposed atomic theory of matter
- 14. ______ litres of water needed to make 2 and a half sheets of paper
- 17. Used in rubbers for elasticity
- 18. ______ water is fit for drinking
- 20. Bromine exist as solid/liquid/gas
- 21. Symbol of silver