Daily Archives: August 29, 2010

Sinabung erupts in Sumatra

Posted on August 29, 2010 by Rashid Faridi

Mount Sinabung volcano on Sumatra erupted shortly after midnight local time on 29 August 2010, producing lava and throwing ash 1500 metres above the summit. Local inhabitants fleeing their homes have spoken of ’thick black smoke, small stones and sulphur’ … Continue reading →

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Gems and The Moh’s Scale

Posted on August 29, 2010 by Rashid Faridi

In the old days, people believed gems held magical powers. Gems are very valuable. Diamond is the hardest naturally occurring substance with a hardness of 10. Its crystal system is cubic because it has 4 equidistant neighboring crystals. Its specific … Continue reading →