Tornadoes are the most violent storms on Earth, with wind velocities that can exceed 200 miles per hour. How do these terrifying cyclones form?

Explore the ancient methods of growing glaciers, the homemade bodies of ice used as water sources, and how they can be used to combat climate change.

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. Lesson by Alex Gendler, animation by Augenblick Studios.

In 1816, Europe and North America were plagued by heavy rains, odd-colored snow, famines, strange fogs and very cold weather well into June. Though many people believed it to be the apocalypse, this year without a summer was actually the result of a supervolcano eruption that happened one year earlier over 1,000 miles away.

Take a look at the theories behind why earthquakes occur, what makes them so hard to predict and the warning system technologies we rely on today.

Earthquakes have always been a terrifying phenomenon, and they've become more deadly as our cities have grown -- with collapsing buildings posing one of the largest risks. But why do buildings collapse in an earthquake? And how can it be prevented?