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The Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer material. It was created in 1812 by the German geologist and mineralogist Friedrich Mohs and is one of several definitions of hardness in materials science.

The Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer material. It was created in 1812 by the German geologist and mineralogist Friedrich Mohs

The Jumbotron is a mess! Download this exclusive activity page and unscramble the screen to see the racer rankings.

9 Favorite Disney Cars to Fuel Your Motormania

The Jumbotron is a mess! Download this exclusive activity page and unscramble the screen to see the racer rankings.

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