how sand is formed into glass
Lightning striking sand melted it into long, thin tubes of glass, and volcanoes erupting melted rocks and sand into glass The earliest glass made by humans was probably a glaze on ceramic pottery made somewhere around 3000 BC Today, three inexpensive ingredients, sand, soda ash, and lime, are melted together to make glass . How to Make Glass (with Pictures) wikiHow. Nov 18, 2010· Groundup ...