Cafe

Additional information: Calbuco volcano has 2003 meters height (6572ft). The impressive ashes column you see in the video had a calculated height of 15km (9.3mil), from which you clearly see about 10km (6.2mil) before to get lost inside the atmosphere static zone where the ashes created a huge and dense cloud that now is traveling around the world.

The immense swell of a tsunami can grow up to 100 feet, hitting speeds over 500 mph -- a treacherous combination for anyone or anything in its path. Alex Gendler details the causes of these towering terrors and explains how scientists are seeking to reduce their destruction in the future.

Australian tourists Linda and Philip McNamara filmed the eruption of Papua New Guinean volcano, Mount Tavurvur, on August 29. You can literally see the shockwave!

Baltimore Landslide April 30th, 2014

Meteorite explosions in the skies of Russia's Urals region has sparked panic in three major cities. Witnesses said that houses shuddered, windows were blown out and cellphones stopped working.

Video of a strong tornado crossing State Highway 4, just north of Langley, Kansas, southwest of Salina, Kansas on April 14, 2012. Tim Samaras is a National Geographic Explorer and severe storms researcher.