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.
Respirable crystalline silica â very small particles at least 100 times smaller than ordinary sand you might find on beaches and playgrounds â is created when cutting, sawing, grinding, drilling, and crushing stone, rock, concrete, brick, block, and mortar.