| 21. | Astronomical cycles correlate perfectly with glacial and interglacial periods, and their transitions, " inside " an ice age.
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| 22. | During the last interglacial period, the Red Sea coast of Eritrea was occupied by early anatomically modern humans.
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| 23. | Increases in greenhouse gases, such as by volcanic activity, can increase the global temperature and produce an interglacial period.
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| 24. | During the final stage of the Riss-Wurm interglacial period the shoreline was six meters above the present sea level.
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| 25. | From there they spread north during the interglacial periods, mainly as migrants, returning to the ancestral region in winter.
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| 26. | Kuhle explains the interglacial periods by the 100, 000-year cycle of radiation changes due to variations in Earth's orbit.
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| 27. | It is the current interglacial period, and it has proven to be a relatively stable environment of the Earth.
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| 28. | These conditions typically last for about 100, 000 years and are followed by brief interglacial periods of more temperate weather.
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| 29. | There is strong evidence that the Milankovitch cycles affect the occurrence of glacial and interglacial periods within an ice age.
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| 30. | Tree species spread outward from refugia during interglacial periods, but in varied patterns, with different trees dominating in different periods.
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