- - periods of interest to glaciologists
- - Glacial periods in the Earth's history
- - Cooling-off periods
- - Glacial periods
- - Frozen periods
- - Periods with the largest glaciers
- - Subjects in paleoclimatology
- - Very cold periods
- - Historic cold periods
- - Periods in stark contrast to global warming
- - Super-cold periods
- - Periods in contrast to global warming
- - Deep-freeze periods
- - They lead to major topographical changes
- - Deep freezes, so to speak
- - Cold periods, that is, around the front of prisons
- - Glacial epochs
- - long-term freezes
- - Times for deep freezes
- - Colds that stick around for a long time
- - Colds that last a long time
- - Glacial eras
- - No mere cold snaps
- - Colds that don't go away for a long time
- - Major cold spells
- - Times of widespread glaciation
- - Cold spells
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