Tabular iceberg in front of the Jakobshavn Isbræ terminus

At times, the glacier begins to float when it reaches the ocean, producing tabular icebergs, which remain the surface crevasses still visible as in the example shown here. When the glacier calves from a grounded calving front, icebergs topple in more domino-like fashion, often in rapid succession.

Credit: Ian Joughin, PSC/APL/UW

• Greenland’s fastest glacier reaches record speeds (3 February 2014)

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