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The Mohs scale definition of hardness is that a harder material has the ability to scratch a softer material. So (according to the Mohs definition) one material can scratch another one because it is harder.
A material that has a larger density than the surrounding material has the natural tendency to sink.
Diamond
Anon Legion Sunglasses have lenses made from scratch resistant material.
Wood
Water
No it is not. Use a gentler cleaner that will not scratch.
Quartz, with a hardness of 7, will scratch calcite, with a hardness of 3.
A submarine is made from strong material so it can withstand the tremendous pressure at depths.
material that sink has a density above that of water and does not obey the law of floatation.
That depends what you scratch it with, what material the rock is made from, and how much force you apply when scratching.
Hardness