Wood is generally softer than glass. This is due to the differences in their molecular structures and hardness properties. Glass has a higher hardness rating on the Mohs scale, which is a scale used to measure the scratch resistance of materials. Glass typically ranks between 5.5 and 6.5 on the Mohs scale, while wood generally ranks between 2.5 and 4.5. This indicates that glass is harder and more resistant to scratching than wood. For example, diamond, which is the hardest known natural material, ranks at 10 on the Mohs scale, and it can easily scratch glass but not wood. The hardness of glass is also a result of its non-crystalline structure, which allows it to be melted and cooled into a solid form without the formation of a crystalline lattice. In contrast, wood is a crystalline material, which contributes to its lower hardness.