| A glaciation, often called an ice age, is a geological phenomenon in which massive ice sheets form in the Arctic and Antarctic and advance toward the equator. |
| •owl:Thing |
| •SpatioTemporalThing |
| •Perdurant |
| •Event |
| •Phenomenon |
| •EarthSciencePhenomenon |
| •CryosphericPhenomenon |
| •Glaciation |