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.
Sandy was responsible for nearly $65 billion (U.S) dollars in damage. 1  Satellite image of Sandy shortly before landfall on October 29, 2012. Image via NASA/GSFC Hurricanes vary in size and intensity, but Hurricane Sandy spread tropical storm winds over 900 miles, and typical systems are roughly 200 to 400 miles across.