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 Ice Age and its effect on Human Migration. By Hans Berekoven. It is now well established that Ice Ages did exist and that the last Ice Age ended approximately 12,000 years ago. We also know that the Asian Continent was at that time populated by nomadic peoples, Hunters and Gathers.