| 1. | The lake was formed over 20, 000 years ago by glacial erosion.
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| 2. | Kantishna, it is the result of both glacial erosion and ice-block melting.
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| 3. | Many valleys of the Swiss Alps are U-shaped due to glacial erosion.
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| 4. | Jefferson's height before this intense period of glacial erosion is estimated at.
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| 5. | Glacial erosion was likewise responsible for scooping out the shallow lakebed.
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| 6. | The hard diabase layer resisted the glacial erosion of the last ice age.
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| 7. | Eventually, this hollow may become large enough that glacial erosion intensifies.
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| 8. | Many present-day outcrops of Sioux Quartzite were exposed by glacial erosion during the Quaternary.
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| 9. | The park has been subjected to hundreds of thousands of years of natural non-glacial erosion.
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| 10. | German geologist Penck and American geologist Davis were vocal supporters of this unprecedented glacial erosion.
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