Answers

2014-02-14T17:48:06+01:00
Chalk are such that it is soft, white, and quite easy to break, it can also be carved
DIAMOND
Diamond is the hardest known natural material on Earth.Diamond conducts heat 5 times faster than copper, which is why it feels cold to the touch.Pure diamond is the most transparent material known. It reflects visible light, ultra-violet light, and infrared light, and all the frequencies in between.
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2014-02-20T10:25:14+01:00
Chalks are such that it is soft, white and so easy to break.
Diamond is the hardest known material on earth.
Pure diamond is the most transparent material known.
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