Across
- 1. Two or more forms of the same element with different numbers of neutrons in the nucleus
- 3. Absorbed from sunlight
- 4. Iron oxide
- 5. Combustion that has enough oxygen
- 9. Combustion with not enough oxygen
- 11. Contains chlorophyll
- 12. A carbon trap
- 13. Speeds up reactions
Down
- 2. reaction A reaction that takes heat from surroundings, making it colder
- 6. A reaction where the reactant has more heat than the product
- 7. The outcome of a chemical reaction
- 8. A substance that changes in a reaction
- 10. Gradual destruction of a metal
- 11. Makes plants green