Across
- 1. What comes after 2016
- 4. If rain travels 2km/h,when will it rain
- 5. cell What does every people need
- 8. Elemnet used for nuclear power plant
- 9. How many atoms are there
Down
- 2. How many elements are there
- 3. How to fill a pool
- 6. Centre of an atom
- 7. Lightest noble gas