Why is Slate important?

Related questions

1. What color is blue slate?
2. What is Slate electors?
3. What does slate look like?
4. Does slate absorb water?
5. How often should you seal slate floors?
6. Why Electoral College vs popular vote?
7. Can slate roofs last forever?
8. What is black slate?
9. Does slate scratch glass?
10. Where is Slate found?

Tags

1. #metamorphism
2. #attractive
3. #grade
4. #slate
5. #variety
6. #popular
7. #durability
8. #alteration
9. #grained
10. #created
11. #mudstone
12. #foliated
13. #flooring
14. #appearance
15. #flagging
16. #metamorphic
17. #regional
18. #shale
19. #because
20. #roofing