Does sand burn?
In the presence of a strong enough oxidizer, almost anything will burn.
"No. Sand and cement will not burn." (Old answer) Actually, just about anything WILL burn with enough heat, including sand and cement. Sand has been used for centuries to make glass and ceramics, and more recently to make silicon for electronic chips and components. Of course, very few people would have access to heat high enough to melt/burn sand. Interestingly, after using a cinderblock as a beam-stop while tuning a laser, I was surprised to…