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Science and Technology Crossword 10

Click on a number in the crossword, write your answer, and then click "Enter". (Click "Hint" if you need help to get the next letter in each word.)
1     2    3     
       4   
5       6     
        
7    8     9     
  10     11     
        
12          

Across

1. Mathematical relationship in symbols
5. Standardised quantity
6. Prefix signifying "life"
7. Natural watercourses
10. Symbol for element "argon"
11. Hot drink made by infusion
12. Powered by batteries, for example

Down

1. Chemical that reduces tooth decay
2. Physical substance
3. Site of scientific experiments
4. Type of battery
8. Windmill or turbine blade
9. Light-emitting celestial body