Across
- 2. Which is the purest form of carbon?
- 4. What is the toxicity caused by silicon called?
- 7. Which is called white poison?
- 8. Which element is a liquid at ordinary temperature?
- 10. Which gas evolved from paddy fields and marshes?
- 12. What is the biggest planet in our solar system?
- 13. What is the hardest natural substance on Earth?
Down
- 1. Which is the main gas that makes up the Earth’s atmosphere?
- 3. With which polymer, the cabinets of radio and TV made of?
- 5. What is a material that will not carry an electrical charge called?
- 6. Which metal is used in the making of microchips?
- 8. What is the study of mushrooms called?
- 9. Which type of plastics can be recycled?
- 11. Which toxic element present in automobile exhausts?