Across
- 2. Send sth into the sky or into space.
- 5. The academic study of sth to discover new information.
- 7. The renewable and non-renewable materials from the planet.
- 8. Observe the progress of sth for some time.
- 9. To use sth completely.
- 10. An object put in orbit around the earth
Down
- 1. Prevent sth from being damaged or destroyed.
- 3. The gases that surround a planet.
- 4. The outside part of something.
- 6. A group of animals or plants with similar characteristics.