Across
- 2. dead plants and animals get eaten and carbon returned to the soil
- 5. a metal is shiny
- 8. The smallest part of a substance that can exist
- 9. consists of only one type of atom
- 10. a chemical reaction that is often called burning
Down
- 1. fuel found in nature that is made of dead animals/plants over thousands of years
- 3. word that describes what a substance is like
- 4. plants take in CO2 and release oxygen this way
- 6. negatively charged particle that orbits the atom
- 7. Two or more atoms bonded together
- 8. a mixture of different metals
- 11. the centre of the atom that holds protons & neutrons