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The hardest substance in a rock would be the hardest mineral of which the rock is composed.
The hardEST is a diamond, and some other hard ones are corundum and topaz. If you look up Moh's hardness scale, it will show you some.
The third hardest gemstone is ruby and then the fourth hardest is emerald.
Actually, Quartz IS a mineral itself. It is one of the hardest there is. (fourth hardest on the most common hardness scale.)
The hardest substance that is naturally occurring is a diamond. However, there are harder substances that have been made by scientists in labs.
yes
After the revolution, Mollie has the hardest time adapting to the new way of life. It is very hard for her to give up her old lifestyle.
whichever way you want, it doesnt matter
The Hardest Way to Make an Easy Living was created on -20-11-10.
No
No, Diamond which is entirely made up of carbon is the hardest
Sit up straight, shoulders back, and legs crossed; hands in lap, too. (optional)
If you mean a sit-up as in the exercise, the plural is sit-ups.
nicotine.
beveled side up
Don't sit up.
by telling him to sit