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Could someone explain this image of glass on a macro and micro level?

Asked by Coting (371points) January 31st, 2010

http://yfrog.com/1n53972453j

On the 1µm level what are they showing? The covalent bonds are on the next level that are amorphous so what are they shower there?

Also do the number of cracks effect the fracture strength?

Now I know the last image is of silica but could you give me a brief description of what is happening. Also what does semi-conduction optical mean?

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