| 21. | The required silica was provided by volcanic exhalations and / or by upwelling.
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| 22. | Bambach and his associates propose several possible explanations for a catastrophic carbon dioxide upwelling.
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| 23. | World War II, of course, unleashed a further upwelling of patriotic fervor.
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| 24. | Americans reacted to the attacks last fall with a tremendous upwelling of patriotic feeling.
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| 25. | Nonetheless, some diffusive upwelling does probably occur.
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| 26. | Major upwelling occurs between 25 degrees northern latitude ( Canary Current, 2002 ).
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| 27. | Upwelling occurs year-round at Cap Blanc ( Ras Nouadhibou ) and northward.
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| 28. | The most common occurrence of phosphorites is related to strong marine upwelling of sediments.
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| 29. | This mechanism in best illustrated when comparing the Peru and northwest Africa upwelling systems.
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| 30. | The upwelling magnetic flux pushes through the photosphere, exposing the cooler plasma below.
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