Across
- 2. Most abundant gas in air
- 4. A biological process that plants synthesize glucose and oxygen
- 7. An element which is a yellowish green gas
- 8. The basic units of a chemical element
- 9. An input device commonly contains about 80 keys
- 10. The force of attraction between object due to their mass
Down
- 1. A common search engine
- 3. A community of living organisms interacting with their environment
- 5. A proposed explanation for a phenomenon, to be test through experiment
- 6. How fast an object is