An iceberg carries a rock though Jökulsárlón, Iceland's glacial lagoon. Glaciers have been known to carry rocks great distances. Rocks fall onto glaciers, which move slowly down mountains. When the glacier melts so much that it can no longer support the rock, the rock is dropped and it becomes known as a glacial erratic. The term referrs to rocks that are different in size, shape or composition from other rocks around them.
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