According to the latest theory, the Mediterranean Sea may have been formed by the largest flood in history. Over 5 million years ago, water from the Atlantic Ocean is believed to have broken through ...

While so many of Earth's bodies of water are murky and polluted, this one in South America is absolutely pristine with crystal-clear views.

A little over 5 million years ago, water from the Atlantic Ocean found a way through the present-day Strait of Gibraltar.

Mercury pollution in the Amazon is caused by gold mining. Discover how tree core samples identify the concentration and spread of this toxin.

Arizona's water agency has proposed cuts in water use across the Willcox basin, goals residents want flexibility, alternative to AMA.