nothing12456 nothing12456

04-10-2017
Physics

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What two minerals would be most useful as grains on sandpaper

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eventsbychasitov20v6 eventsbychasitov20v6

04-10-2017

diamond and borazon are the two hardest materials known

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JAIDA123456789 JAIDA123456789

04-10-2017

I Think it is Quartz

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