NASA researchers have created a model that analyzes various weather conditions, including rainfall, to predict the formation and spread of fires.

The largest river in the world is full of bends and meanders, a result of the water course snaking back and forth across the landscape over time.

As smoke streamed toward San Francisco, more than 1,000 fire personnel were at the scene fighting the blaze.

The dust in the skies over the Caribbean and Southern United States has distant origins.

A jumble of hot ash, rock, and soil poured down the slopes of the Guatemalan volcano in early June. Weeks later, satellites continued to detect elevated temperatures in the thick deposits.

After torrential flooding the upper Midwest, sediment runoff discolors Lake Superior.