Across
- 2. – a type of material
- 4. – steady and not changing
- 6. – something you must have; something needed
- 10. – became hard or firm
- 12. – a group made at the same time
- 13. – unhappy or annoyed
Down
- 1. – system that uses waves to detect objects
- 3. – unwound or straightened
- 4. – a thin, small piece
- 5. – a place or position
- 7. – guessed without full proof
- 8. – carefully examined or studied
- 9. – place where experiments are done
- 11. – very interesting