Some paper can be harder than some rubber. There are too many types of both paper and rubber to make a generalisation.
woodrubberbreadplasticglassoilgasolinepaintclothvarnishpure distilled waterairceramicpotterylimestonesandstonemarblegranitebasaltpapermicaleatherconcreteseashellsasphaltetc.
Over 9000!
You deflate it, thus increasing the relative thickness of the rubber.
Graphite (carbon), wood and rubber for the eraser.
rubber is harder than chalk !
Some paper can be harder than some rubber. There are too many types of both paper and rubber to make a generalisation.
Yes.
Yes
It can be and can't be. It really depends on what sort of wood.
No
The density of rubber can vary, and the density of wood can vary even more (unless we're putting air in the rubber to make foam). In general, however, wood is less dense than rubber, rubber is less dense than copper, and copper is less dense than mercury.
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Because rubber is harder to brake than most materials out there and it doesnt attrack electricity
One is sharper than the other. Like metal is harder than wood so the mettal one has to be harder.
pine tree
You can buy rubber wood by shopping at your local home supply store. Home Depot and Lowe's both offer forms of rubber wood mulch and rubber wood for building.