| 1. | The subglacial tunnel valley networks originally formed near the ice margin.
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| 2. | Each of these have also been referred to as tunnel valleys.
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| 3. | In between them lie the tunnel valley lakes and kettle lakes.
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| 4. | Tunnel valleys were formed by subglacial erosion by water.
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| 5. | Tunnel valleys or tunnel channels are produced by meltwater flows beneath glacial ice.
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| 6. | Tunnel valleys represent a substantial fraction of all melt-water drainage from glaciers.
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| 7. | Tunnel valley channels often start or stop abruptly.
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| 8. | Tunnel valleys, by contrast, are not commonly found in Northern Central Europe.
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| 9. | Meltwater from the glacier eroded the valley, shaping it into a tunnel valley.
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| 10. | Tunnel valleys are typically eroded into bedrock and filled with glacial debris of varying sizes.
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