Across
- 3. this type of material was discovered in 1870
- 4. how many elements everything is made of
- 6. The 19th Century brought the Industrial _________
- 8. the type of balloon that helps discover air pressure
- 9. even today, we use carbon dioxide monitoring to study this important part of our world
- 12. electrons orbit around this
- 13. The 17th Century was The Age of __________
- 15. what everyone wanted to make during the middle ages
- 16. a candle cannot burn without this element
- 17. 200 times stronger than steel
Down
- 1. Marie Curie was discovered a way to treat this disease
- 2. first produced in 3200 BCE
- 4. the first step in science dating back to 790,000 BCE
- 5. all matter consists of _______
- 7. the discovery that led towards understanding the structure of atoms
- 8. how Al-Razi classified the elements
- 10. accidentally made by mixing saltpeter, sulfur, and charcoal
- 11. French chemist discovers that water is made of oxygen & this
- 14. determines whether a substance is acid, neutral, or base