Diamond is the hardest.
Diamond
Diamond
diamond
soap
steel
diamond
steel
wood
plastic
rubber
soap
chalk
diamond
With every stroke of the chalk piece it leaves some of the chalk on the board. This abrasion of the piece of chalk causes it to wear down. This is similar to why the rubber tyres of cars wear down when they are driven over a road surface.
Some examples of compounds are water, table salt, table sugar, chalk remover, rubber, acetone, caffeine etc.
chalk comes from chalk deposits the white cliffs of dover is one then the grind it into powder then they press it into molds of chalk then they sell it
The word 'chalk' is a neuter noun, a word for a thing that has no gender.
He wanted a piece of chalk lit
diamond
rubber is harder than chalk !
Plastic or rubberIt is made out of rubber.
A piece of chalk.
No. Hardness is measured on the Mohs Scale, named after German Friedrich Mohs. On this scale Talc (the softest) measures 1, while Diamond (the hardest) measures 10. Glass has a Mohs' scale hardness of around 5.5, so anything above that will have the ability to scratch glass. For example, quartz (Mohs 7), hardened steel (Mohs 8), corundum (rubies and sapphires, Mohs 9),or diamond (Mohs 10). The Mohs scale is purely an ordinal scale, expressing relative hardness in a simplistic way. Carborundum (Mohs 9) is twice as hard as Topaz (Mohs 8), but diamond (Mohs 10) is four times harder than arborundum.
an iron nail
Chalk dust (calcium carbonate) is not magnetisable.
Materials used in playing baseball include chalk, plastic, wood, leather, metal, and rubber. The chalk is used to mark the various lines on the field, the plastic is used in helmets, wood is used in the bats, leather is used in gloves and cleats, metal is used for the cleat spikes, and rubber is used for the bases.
With every stroke of the chalk piece it leaves some of the chalk on the board. This abrasion of the piece of chalk causes it to wear down. This is similar to why the rubber tyres of cars wear down when they are driven over a road surface.
Chalk is a sedimentary rock composed primarily of Calcium Carbonate. Calcium carbonate is also the number one mineral at the Marble spec. Hardness of Chalk is around 3 Mohs. Granite stay at the number 7 at the Mohs scale and Granite is harder than Marble. Granite is mostly composed by feldspat (christal).
the outer part is made out of a type of plastic and the outer part the wipes the chalk off is a cloth
chalk