Top 10 movies on theaters box office July 2015 third weekend. Check out the list of the top 10 movies on the U.S. and Canada theater box office during July's Third weekend.
If conditions are right, the fused sand forms long hollow tubes called fulgurite. The term comes from the Latin word fulgur, which means lightning. Although lightning strikes earth at least a million times each day, only rarely does fulgurites form. Fulgurites are usually found beneath the surface of the sand, generally decreasing in diameter and sometimes branching outs as they descend.
Before glass, homes must either have been very dark but warm, or light but cold. Smashing Stuff. Glass is sand thatâs been heated to a very high temperature. Obsidian is a natural glass, made by volcanic eruptions millions of years ago. Lightning strikes on sand also produce natural glass, called fulgarites.