Why glasses are transparent ?

Glass is made up from Si & O ,it is commonly found from sand. Si & O are bonding together to form a crystal ,when we melt it.
Now why glasses are transparent. In Silicon di oxide ,electrons orbit are so far from one to another.So that it will allow photons through it.So light is not reflected and looks transparent.
But why other solids are not transparent.If any solid object look like green color that is not a green color ,other colors are passes through it ,green color is reflected that's why we saw green color. The lights pass through that object but some photon rays are hits the electron to change orbit ,this effect causes color reflection.But how the color are varient ,because it's depend on the structure of the electron orbit & speed of electron.The electron speed decides the reflection rate ,that decide wavelength.Finally wavelength decides color.We saw green color (approx) 560-520 nm wavelength.

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