Across
- 2. a mountain from which lava and gases come out
- 3. make sth work
- 7. find the size, quantity of sth using standard
- 9. the outside or top layer of sth
- 10. mention a subject
Down
- 1. that can be used instead of sth else
- 4. an arrangement of colours or shapes that is repeated.
- 5. progress
- 6. not smooth
- 8. rover a robot used to explore Mars
- 11. a picture.