"General Knolwdge": HTML5 Crossword

Across

2. 8 x 4 - (25-7) = (8)
6. Scientist who was hit in the head by a falling apple (11)
10. The football team with the most Champions League titles (10)
11. What does TKO mean? (17)
12. The name of valley's formed by moving glaciers (13)
14. The gas most of Earth's atmosphere is formed of (8)
16. Rockstar's best selling game (15)
18. The name given to the perimeter of a circle (13,0)
20. Arnold Schwarzenegger's country of birth (7)

Down

1. Place in China that was the origin of Covd-19 (5)
3. The rugby team with the most Champions Cup titles (8)
4. The state Sleepy Joe Biden lives in (8)
5. The atomic a particle with a neutral charge (7)
7. The largest land mammal on Earth (15)
8. The largest county in Ireland (4)
9. Individual bones found in the spine (9,0)
13. Famous boating shoes worn by fee paying school goers (8)
15. The 19th element on the periodic table (9)
17. The highest city in the world (5)
19. Positively charged atomic particle (6)