Gorgeous Pictures of Waterfalls

 Cool off with these stunning shots of one of nature's most dramatic forces.

Hydrology's usually a bit of a dry subject. But when the study of water's movement across Earth helps us understand how waterfalls work, it becomes very dramatic indeed. 

GODAFOSS, ICELAND

Icy conditions made this shot a challenge: "Water spray was constantly refreezing to my lens, so I had to frequently wipe it down," says photographer Ed Graham.

KIRKJUFELLSFOSS, ICELAND

"The night left a thin layer of snow over the highest mountains [in] fresh air that is difficult to have in our cities," describes photographer Alessandro Mari. Here, the runoff from Iceland's most photographed mountain forms a waterfall.

 BY RACHEL BROWN 

Reference: National Geographic