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.
Hurricane Sandy four years later: Remembering the historic storm and its aftermath. A look back at Hurricane Sandy four years later. Hurricane Sandy struck with a vengeance on Oct. 29, 2012, causing unprecedented destruction as 80 mph winds and record storm surges wreaked havoc across the East Coast. As the city observes the 4th anniversary, take a look back the destruction caused by the biggest storm to ever hit the US mainland.