| 1. | Thick permafrost characterized by massive ice wedges has developed in these sediments.
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| 2. | Ice wedges usually appear in a polygonal pattern known as ice wedge polygons.
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| 3. | Ice wedges usually appear in a polygonal pattern known as ice wedge polygons.
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| 4. | Several techniques have been used to deduce the ice wedging, patterning and hummocked ground.
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| 5. | Ice wedges enlarge with successive seasons of freezing and thawing.
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| 6. | Some ice wedges that have been buried for centuries are revealed during excavations or landslides.
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| 7. | These sediments contain pollen typical of the mammoth tundra-steppe environments and large ice wedge polygon systems.
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| 8. | Ice wedges indicate a long period of permafrost.
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| 9. | As this process continues over many years ice wedges can grow, up to the size of a swimming pool.
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| 10. | When ice wedges connect to one another, they can form tundra polygons, which are also visible at Pingo National Landmark.
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