| 11. | I'm wondering, during a glacial period, where does the ice actually come from?
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| 12. | During warmer post glacial periods, elephants and hippopotami roamed the valleys.
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| 13. | The glacial periods contributed large amounts of sediment to the trough.
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| 14. | During the glacial periods, the volcano most likely featured small glaciers.
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| 15. | The planet may be entering another glacial period by this time.
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| 16. | It arose during glacial periods and survived the subsequent warming of the local climate.
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| 17. | The pond was formed by the Wisconsin Ice Sheet during the last glacial period.
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| 18. | Her�ubrei?was formed beneath the icesheet that covered Iceland during the last glacial period.
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| 19. | During this last glacial period, there were several changes between glacier advance and retreat.
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| 20. | During glacial periods more of Zealandia becomes a terrestrial rather than a marine environment.
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