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Yes. The MOH's scale is relative, it's not exact. To know if something is a 3 you would need higher and lower hardnesses to test against.
No, you generally cannot scratch shale with your fingernails. Shale is a sedimentary rock that is relatively hard and composed of clay minerals, making it more resistant to scratching. Fingernails have a hardness of about 2.5 on the Mohs scale, while shale typically has a hardness of around 3 to 4. Therefore, a fingernail would not be able to leave a scratch on shale.
A varnish or lacquer would do the trick, though nothing actually makes wood scratch proof just scratch resistant
yes you can scratch paint off of anything with enough time
Ugh, ump, urn and use are 3 letter scrabble words. They begin with the letter u.