JEREMY WALKER / SCIENCE PHOTO LIBRARY JEREMY WALKER / SCIENCE PHOTO LIBRARY
Franz Josef glacier. This is the source of the glacier. Falling snow and ice are compacted over time and form a slow-moving mass of ice, which descends down the mountains. The Franz Josef glacier flows from the Southern Alps through Westland National Park, on New Zealand's South Island. It is around 12 kilometres long, and is one of the few glaciers in the world that is advancing rather than receding.
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