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.
Lightning and Thunder. Lightning is the spark caused when electricity that has built up in a thunderhead discharges. One theory is that air in motion rubs particles of ice and rain moving downward against particles moving upward. As the particles rub together they become charged with static electricity.