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An '''Ice Age''' is a period of [[Earth]]'s history when [[ice]] sheets covered a much larger part of the [[planet]] than is currently the case.

An '''Ice Age''' is a period of [[Earth]]'s history when [[ice]] sheets covered a much larger part of the [[planet]] than is currently the case.

Earth and rock worn and smoothed by ice sheets, along with U-shaped [[valley]]s are the main evidence for an Ice Age, and there is evidence of such [[glacier|glaciation]] covering northern [[Europe]] (including most of [[Britain]]), most of [[Canada]], and into the northern parts of eastern half of the [[United States]].<ref Name="WBE">Ice Age, World Book Encyclopedia 2000 CD ROM</ref>

Earth and rock worn and smoothed by ice sheets, along with U-shaped [[valley]]s and termination deposition debris, are the main evidences for an Ice Age, and there is evidence of such [[glacier|glaciation]] covering northern [[Europe]] (including most of [[Britain]]), most of [[Canada]], and into the northern parts of eastern half of the [[United States]].<ref Name="WBE">Ice Age, World Book Encyclopedia 2000 CD ROM</ref>

During an Ice Age, lowered sea levels would result in [[land bridge]]s in some places where there are now [[ocean]]s and [[strait]]s.

During an Ice Age, lowered sea levels due to the water being tied up in glaciers and ice caps would result in [[land bridge]]s in some places where there are now [[ocean]]s and [[strait]]s.

According to secular [[geology]], there have been several Ice Ages, the oldest being 2.3 [[billion]] years ago, and the most recent finishing around 11,500 years ago.<ref name="WBE" /><ref name="CAB">Batten, 2007</ref>

According to secular [[geology]], there have been several Ice Ages, the oldest being 2.3 [[billion]] years ago, and the most recent finishing around 11,500 years ago.<ref name="WBE" /><ref name="CAB">Batten, 2007</ref>