| 21. | He is a published geologist who has researched mountain building processes through fieldwork in the French-Italian Alps.
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| 22. | The fault occurred in the Caledonian orogeny, during a late stage of this period of mountain building.
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| 23. | This low angle moved the focus of melting and mountain building much farther inland than the normal.
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| 24. | Either mountain building or upheavals of semi-molten rock inside the earth had periodically made the earth unstable.
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| 25. | During the later Miocene Florida was exposed as dry land again due to geologic uplift and mountain building.
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| 26. | By the Late Permian, much of the continental plate collision had subsided; the mountain building however, still continued.
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| 27. | It was uplifted during the period of mountain building that formed the Appalachians, known as the Appalachian orogeny.
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| 28. | Mountain building occurred at this point.
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| 29. | Some scientists hypothesize that the tectonic processes of plate subduction and mountain building are products of erosion and sedimentation.
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| 30. | A number of mountain building periods were involved in the formation of the Central Pangean Mountains, including the orogenies.
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