Western part of waterfall scar 120m high and 5km wide created by giant floods when Lake Missoula's ice dam was breached at end of Ice Age, Dry Falls, Grand Coulee, Washington state, United States of America, North America

aerial photo of the Oker reservoir in the Harz mountains, Lower Saxony, northern Germany

Polar Bears (Ursus maritimus), female and juvenile moving through the pack ice, Spitsbergen Island, Svalbard Archipeligo, Svalbard and Jan Mayen, Norway, Europe

Polar Bears (Ursus maritimus), female and juvenile on an ice floe in the pack ice, Spitsbergen Island, Svalbard Archipeligo, Svalbard and Jan Mayen, Norway, Europe

Polar Bears (Ursus maritimus), female and juvenile on an ice floe in the pack ice, Spitsbergen Island, Svalbard Archipeligo, Svalbard and Jan Mayen, Norway, Europe

Polar Bears (Ursus maritimus), female and juvenile on an ice floe in the pack ice, Spitsbergen Island, Svalbard Archipeligo, Svalbard and Jan Mayen, Norway, Europe

Polar bears (Ursus maritimus), mother animal and two young cubs, three month old, on an iceberg, Unorganized Baffin, Baffin Island, Nunavut, Canada, North America

Polar bears (Ursus maritimus), mother animal and a 15 month old cub on an iceberg, Unorganized Baffin, Baffin Island, Nunavut, Canada, North America

Polar bear with baby on ice floe, East coast Greenland, Denmark, Europe

Polar Bears (Ursus maritimus), female and juvenile on an ice floe in the pack ice, Spitsbergen Island, Svalbard Archipeligo, Svalbard and Jan Mayen, Norway, Europe

Polar bears (Ursus maritimus), cub , 15 months old, looks down onto mother animal and sibling from an iceberg, Unorganized Baffin, Baffin Island, Nunavut, Canada, North America

Polar bear with baby on ice floe, East coast Greenland, Denmark, Europe

Golden evening mood, sandbar with ice on the southern shore, winter weather, low water at Möhnesee, Sauerland

Polar bear with baby on ice floe, East coast Greenland, Denmark, Europe

Polar Bears (Ursus maritimus), female and juvenile on an ice floe in the pack ice, Spitsbergen Island, Svalbard Archipeligo, Svalbard and Jan Mayen, Norway, Europe

Polar bears (Ursus maritimus), mother animal and two young cubs, three month old, lying on an iceberg, Unorganized Baffin, Baffin Island, Nunavut, Canada, North America

Polar Bears (Ursus maritimus), female and juvenile on an ice floe in the pack ice, Spitsbergen Island, Svalbard Archipeligo, Svalbard and Jan Mayen, Norway, Europe

Polar Bears (Ursus maritimus), female and juvenile on an ice floe in the pack ice, Spitsbergen Island, Svalbard Archipeligo, Svalbard and Jan Mayen, Norway, Europe

Aerial view, atolls on Baldeneysee lake, art event for the RUHR.2010, islands in the Baldeneysee lake, Schachtzeichen RUHR.2010 art installation, Essen, Ruhrgebiet region, North Rhine-Westphalia, Germany, Europe

Polar Bears (Ursus maritimus), female and juvenile on an ice floe in the pack ice, Spitsbergen Island, Svalbard Archipeligo, Svalbard and Jan Mayen, Norway, Europe

Polar Bears (Ursus maritimus), female and juvenile on an ice floe in the pack ice, Spitsbergen Island, Svalbard Archipeligo, Svalbard and Jan Mayen, Norway, Europe

Polar Bears (Ursus maritimus), female and juvenile on an ice floe in the pack ice, Spitsbergen Island, Svalbard Archipeligo, Svalbard and Jan Mayen, Norway, Europe

Haltern reservoir with ice floes in evening light, Muensterland, North Rhine-Westphalia, Germany, Europe

Aerial photo, Moehne Dam and Moehnesee Reservoir with ice, snow, winter, North Rhine-Westphalia, Germany, Europe

Aerial photo, Moehne Dam and Moehnesee Reservoir with ice, snow, winter, North Rhine-Westphalia, Germany, Europe