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Across
1. does not burn
4. can be seen through
7. cannot see through and light does not pass through
8. dissolves easily in water
9. has a lot of big muscles
13. does not allow gas, water, etc. to pass through it
15. scratches easily
18. does not break easily
19. does not bend easily
20. bends easily
21. does not dissolve in water
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Down
2. cannot see through but light passes through
3. characteristic or quality of an object
5. the property where little friction is created
6. difficult to scratch
10. burns easily
11. produces little friction when rubbed
12. allows gas, water, etc. to pass through it
14. allows other materials to stick to it
16. rubbing one surface on another
17. has the power to move spontaneously
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