Question

Is glass a highly viscous liquid?

Answer 1

Glass, however, is actually neither aliquid—supercooled or otherwise—nor a solid. It is an amorphous solid—a state somewhere between those two states of matter. And yet glass'sliquidlike properties are not enough to explain the thicker-bottomed windows, because glass atoms move too slowly for changes to be visible.
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Answer 2

yes it is because after 40 to 50 year if you see then the edge of top side is thick and the edge of bottom is thin