Across
- 3. a weight hung from a string
- 5. back and forth motion
- 7. a substance whose crystals can vibrate very fast, at a very precise rate
- 9. standard unit for time
- 10. standard unit for length
Down
- 1. not a standard unit
- 2. standard unit for mass
- 4. the comparison of a fixed quantity with an unknown quantity
- 6. standard unit for temperature
- 8. distance covered by moving an object in unit time