What is glass mainly made up of?

More Questions:

Within 3 years, either way, in what year did Lou Gehrig deliver his famous farewell speech at Yankee Stadium?

What US city hosts the annual Gator Bowl?

What wax sculptor made the death mask of Marie Antoinette?

What two pins are left standing in bowling's hardest split to pick up?

Gouda cheese originated in which country?

The "Carnac Stones" are located what country?

What has superseded Newtonian mechanics of the atomic scale?

In the human body where is your occiput?

Saanen, hongtong and toggenburg are all breeds of which animal?

In The Simpsons, when Homer is trying to think un-sexy thoughts, he imagines who in a bikini?

What year was Frank Sinatra born in?

The 16th Constitutional Amendment, enacted in 1913 allowed the US federal government to do what?

Which US president delivered the Gettysburg Address?

In what decade was Prince Charles born?

Who took home the Country Music Association very first music video award in 1984 for "All My Rowdy Friends Are Comin’ Over Tonight"?