Aerial of the Eqi glacier, Western Greenland, Denmark, Polar Regions

Unusual window formation in iceberg showing Booth Island in the background on the western side of the Antarctic Peninsula, Antarctica, Polar Regions

Glacial iceberg detail from ice calved off the Sawyer Glacier in Tracy Arm, Southeast Alaska, United States of America

Glacial iceberg detail from ice calved off the LeConte Glacier near Petersberg, Southeast Alaska, United States of America

Glacial iceberg detail from ice calved off the Sawyer Glacier in Tracy Arm, Southeast Alaska, USA.

Glacial iceberg detail from ice calved off the Sawyer Glacier in Tracy Arm, Southeast Alaska, USA.

Glacial iceberg detail from ice calved off the Sawyer Glacier in Tracy Arm, Southeast Alaska, USA.

Glacial iceberg detail from ice calved off the Sawyer Glacier in Tracy Arm, Southeast Alaska, USA.

Aerial view of milky glacial water flow structures and patterns on the Holsa River near Selfoss, just before the estuary, South Coast, Iceland, Europe

The Blue Pools of Makarora offer enticing blue waters to swim in. A man jumps off a bridge into the water in Mount Aspiring National Park; Makarora, New Zealand

Wooden arches and building of the recreated Tjodhilde Church in Greenland's Brattahlid, Eriksfjord area, part of a reconstruction of Erik the Red's settlement, Kujataa World Heritage Site, Qassiarsuk, Southern Greenland, Greenland

Stone and turf structure with wooden doorway at the recreated longhouse in Greenland's Brattahlid, Eriksfjord area, part of a reconstruction of Erik the Red's settlement, Kujataa World Heritage Site, Qassiarsuk, Southern Greenland, Greenland