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MacKenzie Delta 02, Canada/Patterns of the Earth

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MacKenzie Delta 02, Canada/Patterns of the Earth

Polygons - Such structures are typical for tundra landscapes in the permafrost areas. When the ground freezes, it fractures. In summer water trickles into the cracks, freezes again in sub-zero temperatures and expands at the same time. In this way, a grid of cracks filled with water is formed, which dissects the tundra into polygons. These polygons measure up to 15 m in diameter. (aerial view)