Elements of glass

Take a look out your window,put on your glasses if you wear them.You might want to grab a pair of binoculars, too,or a magnifying lens.Now, what do you see?Well, whatever it is,it's not the multiple layers of glass right in front of you.But have you ever wondered how something so solid can be so invisible?To understand that,we have to understand what glass actually is,and where it comes from.It all begins in the Earth's crust,where the two most common elements are silicon and oxygen.