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.
This map shows the extent of the ice sheets over North America during the Ice Age. Scientists who rely on evolutionary thinking believe this was the picture over 10,000 years ago. From a biblical perspective, scientists have suggested the Ice Age was a result of Noahâs Flood only a few thousand years ago.