Extrusive igneous rocks are formed on the surface of the earth. These rocks are formed as a result of a volcanic eruption. Most have a fine grained texture made of small crystals due to rapid cooling. However, some of the lava cools so quickly that no crystals have time to form. An example of this type of rock is obsidian, commonly called black glass or volcanic glass.
Hurricane Sandy (unofficially known as Superstorm Sandy) was the deadliest and most destructive hurricane of the 2012 Atlantic hurricane season, and the second-costliest hurricane in United States history.
Origin of storm. Sandy began as a tropical wave in the Caribbean on Oct. 19. It quickly developed, becoming a tropical depression and then a tropical storm in just six hours. Tropical Storm Sandy was the 18th named storm of the 2012 Atlantic hurricane season. It was upgraded to a hurricane on Oct. 24 when its maximum sustained winds reached 74 mph (119 kph).