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Ice crystals, Science Center, Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

View of the nearly full moon rising over snow-covered mountains on 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 Sawyer Glacier in Tracy Arm, Southeast Alaska, United States of America

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, United States of America

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

Sawyer Glacier calving from Tracy Arm-Fords Terror Wilderness area in Southeast Alaska, United States of America

Panoramic of ice crystals at Lej da Staz, St. Moritz, Engadine, Canton of Graubunden (Grisons), Switzerland, Europe

Ice crystals, Lej da Staz, St. Moritz, Engadine, Canton of Graubunden (Grisons), Switzerland, Europe

Ice crystals, Science Center, Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Guest from the Lindblad Expedition ship National Geographic Explorer photographing soda straw ice in the Svalbard Archipelago, Norway, Arctic, Europe

Guest from the Lindblad Expedition ship National Geographic Explorer holding up a block of ice in the Svalbard Archipelago, Norway, Arctic, Europe

Freshwater melt forming waterfalls in Austfonna, an ice cap located on Nordaustlandet in the Svalbard archipelago, Norway

A view of Krossfjorden (Cross Fjord) on the northwestern side of Spitsbergen Island in the Svalbard Archipelago, Norway

Ice crystals, Lej da Staz, St. Moritz, Engadine, Canton of Graubunden (Grisons), Switzerland, Europe

Jet stream winds over the Annapurna Himalayas with rainbow colours caused by refraction on ice crystals in the clouds, known as parhelion or sundog, Nepal, Asia

Jet stream winds over the Annapurna Himalayas with rainbow colours caused by refraction on ice crystals in the clouds, known as parhelion or sundog, Nepal, Asia

Jet stream winds over the Annapurna Himalayas with rainbow colours caused by refraction on ice crystals in the clouds, known as parhelion or sundog, Nepal, Asia

Ice feathers formed during a hard frost, when temperatures fell below minus 10 during the December 2010 cold snap, Ambleside, Cumbria, England, United Kingdom, Europe

A frozen footprint on a frozen Rydal Water during the December 2010 big chill, Lake District Cumbria, England, United Kingdom, Europe

Grit salt remains the most commonly used method of removing ice and snow from the ground. All kinds of salt are effective at breaking up ice crystals, but grit salt is the preferred method for use in salt-spreading machines as long as the grit salt is kept dry. The grit salt also adds some friction to flat areas, making the ground better for tyres and shoes to grip on to.? . "

Grit salt remains the most commonly used method of removing ice and snow from the ground. All kinds of salt are effective at breaking up ice crystals, but grit salt is the preferred method for use in salt-spreading machines as long as the grit salt is kept dry. The grit salt also adds some friction to flat areas, making the ground better for tyres and shoes to grip on to.? . "

The Lindblad Expeditions ship National Geographic Explorer pushes through ice in Crystal Sound, south of the Antarctic Circle

Flat calm conditions in Crystal Sound, south of the Antarctic Circle, Antarctica, Southern Ocean. MORE INFO This area is full of flat first year sea ice, well developed icebergs, with many open leads.

A small pod of Type B Orca (Orcinus nanus) traveling in ice in Crystal Sound on the western side of the Antarctic Peninsula, Antarctica

The Lindblad Expeditions ship National Geographic Explorer pushes through ice in Crystal Sound, south of the Antarctic Circle, Antarctica, Southern Ocean

The Lindblad Expeditions ship National Geographic Explorer pushes through ice in Crystal Sound, south of the Antarctic Circle, Antarctica, Southern Ocean

The Lindblad Expeditions ship National Geographic Explorer pushes through ice in Crystal Sound, south of the Antarctic Circle

Adult snow petrel (Pagodroma nivea) on the wing in Crystal Sound below the Antarctic Circle, close to the Antarctic peninsula

The Lindblad Expeditions ship National Geographic Explorer pushes through ice in Crystal Sound, south of the Antarctic Circle, Antarctica, Southern Ocean

Ice feathers formed during a hard frost, when temperatures fell below minus 10 during the December 2010 cold snap, Ambleside, Cumbria, England, United Kingdom, Europe

A small pod of Type B Orca (Orcinus nanus) traveling in ice in Crystal Sound on the western side of the Antarctic Peninsula, Antarctica

Iceberg detail in and around the abandoned British research base "W" in Crystal Sound near the Antarctic Peninsula

The Lindblad Expeditions ship National Geographic Explorer pushes through ice in Crystal Sound, south of the Antarctic Circle

The Lindblad Expeditions ship National Geographic Explorer pushes through ice in Crystal Sound, south of the Antarctic Circle

The Lindblad Expeditions ship National Geographic Explorer pushes through ice in Crystal Sound, south of the Antarctic Circle, Antarctica, Southern Ocean

The Lindblad Expeditions ship National Geographic Explorer pushes through ice in Crystal Sound, south of the Antarctic Circle

The Lindblad Expeditions ship National Geographic Explorer pushes through ice in Crystal Sound, south of the Antarctic Circle, Antarctica, Southern Ocean

The Lindblad Expeditions ship National Geographic Explorer pushes through ice in Crystal Sound, south of the Antarctic Circle, Antarctica, Southern Ocean

Iceberg detail in and around Crystal Sound near the Antarctic Circle on the Antarctic Peninsula during the summer months

A small pod of Type B Orca (Orcinus nanus) traveling in ice in Crystal Sound on the western side of the Antarctic Peninsula, Antarctica

Sunset on snow capped mountains and icebergs surrounded in brash ice in Crystal Sound near the Antarctic Circle on the west side of the Antarctic Peninsula.

The Lindblad Expeditions ship National Geographic Explorer pushes through ice in Crystal Sound, south of the Antarctic Circle

The Lindblad Expeditions ship National Geographic Explorer pushes through ice in Crystal Sound, south of the Antarctic Circle, Antarctica, Southern Ocean

The Lindblad Expeditions ship National Geographic Explorer pushes through ice in Crystal Sound, south of the Antarctic Circle