Across
- 1. related to nature
- 2. resistance when two surfaces touch
- 5. velocity
- 6. to slow down
- 9. to speed up
- 10. not active
- 13. increasing in amount over time
- 14. to measure something as an amount
- 16. outside
- 17. characteristic
- 18. swiftly moving dinosaur
Down
- 1. study of motion in nature
- 3. resistance to change in motion
- 4. swiftness
- 7. sound made by touching teeth together
- 8. response to a force, acting again
- 11. to put things back again
- 12. smallest unit of energy
- 14. involving amounts or measurements
- 15. to become less or worse