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Even pure silica has an attenuation of 0.03dB/Km (wavelength unspecified but probably in the near IR) so the thickness of the earth would reduce the intensity of the light by about 10^38 fold. It would be opaque for all practical purposes.
If earth was made of glass, would it be ground glass?
What I want to know is, if the Earth was made of chocolate pudding, would we be able to eat it?