According to an ancient Greek philosopher all matter is comprised of four elements: earth, water, fire and air. Here are 52 natural phenomena and formations by element.

From bright blue sunny skies and other amazing air phenomena and formations to multicolored thunderclouds and chilling airborne disasters and ominous weather patterns.

See incredible images and video film footage of famous hurricanes like Katrina and Ike and tornadoes from Texas, Georgia, Kansas and Tornado Alley.

Using HDR, some photographers are able to depict everything from sunlight to firelight, smoke, sunsets, sun rises and light phenomena in unique ways.

Amazing images, photographs and videos of sun flares, wild fire and forest fire, lightning, smoke art and meteor showers display nature's beauty.

This collection shows off the myriad properties of water - the reflectivity of pools, the transparency of ice, amazing color ranges and other curiously variable properties.

Water disasters around the world including floods, hail, ice storms, tsunamis, waves, and rain.

Elemental earth art featuring ice formations, fjords and waterfalls, glaciers and ice, unusual lakes and beautiful water art.

HDR processes are at once surrealistic and hyper-realistic, natural and artificial, peaceful but vibrant. Here are 25 stunning HDR nature and landscape photos.

See incredible images and descriptions of earth as art, from mountains to caves to craters to rock formations and holes, impressions and other assorted wonders of nature.

The effects of their bites range from painful to deadly for humans, and they inject their prey with lethal salivary secretions that immobilize them and ease ingestion and digestion.

This article will offer beginning tips for two key areas related to "greening" your transportation, from mass transit to fuel hacks to hypermiling.

Once a year, tens of thousands of tourists gather in a town in Spain to hurl over one hundred tons of overripe tomatoes ... all in just one hour.

Everyone knows that goats can navigate extreme terrain but ... trees? Watch these skilled mammals hop gracefully from branch to branch.