Background color for WARNING safety signs, labels, and tags. Marking hazardous parts of machines with may cut, crush, or otherwise injure. Emphasizing hazards when enclosure doors are open or when gear, belt, or other guards around moving equipment are opened or removed, exposing unguarded hazards. Marking exposed edges of
Bibcode:1995GBioC...9..377C. doi:10.1029/95GB01107. An ice age is a period of long-term reduction in the temperature of Earth's surface and atmosphere, resulting in the presence or expansion of continental and polar ice sheets and alpine glaciers.
The transition from the peak of the last ice age around 20,000 years ago to the start of the modern interglacial period (the Holocene) around 10,000 years ago, was interrupted by a sharp return to near-glacial conditions during the Younger Dryas period.This period lasted from about 13,000 years ago to 11,500 years ago.he transition from the peak of the last ice age around 20,000 years ago to the start of the modern interglacial period (the Holocene) around 10,000 years ago, was interrupted by a sharp return to near-glacial conditions during the Younger Dryas period.