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10:23 AM | February 18, 2013
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The concept of geologic time is difficult to convey to introductory science students at any level.  In fact, it is a difficult concept for anyone.  The use of an analogy is probably the most effective way to convey this concept, for example, if a person extended his or her arms at their sides horizontally, the time represented by human history on Earth can be represented by passing a nail file one time over the index finger nail.  The time represented by the total length of the […]

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