Diamond is harder than steel: you can scratch steel with a diamond, but steel will not scratch a diamond.
Yes, graphite is more common than diamond.
Iron is generally harder than bronze, but variations in chemistry or impurities can vary the hardness in both materials.
Yes, most of it is review, but you still learn more than before. And they obviously give you longer harder problems.
No.
Yes an emerald or green beryl is harder than quartz
No. Diamond is harder than emerald.
No, diamond is harder than enamel.
Diamond is harder than plastic.
Diamond is harder than onyx.
nothings harder than a diamond
Diamond is harder than any metal.
Yes, diamond is harder than granite. Diamond is the hardest mineral known. And it is several times harder than granite.
Diamond is harder than steel: you can scratch steel with a diamond, but steel will not scratch a diamond.
Both are considered expensive, but a diamond is more expensive simply because it's a harder mineral.
Yes, harder than any metal.
no