What is the difference between the older continental drift theory by Wegener and the more recent plate tectonic theory? 

1. Describe the general sequence of events in continental drift since the time of 5 separate continents 450 million years ago.  What is the difference between the older continental drift theory by Wegener and the more recent plate tectonic theory?  Plate tectonics theory explains many seemingly unrelated phenomena.  Explain how the patterns of volcanoes and earthquakes related to plate tectonics.  Explain several pieces of evidence that combine to make the theory of plate tectonics the one that is generally accepted. 
2. Provide a reason why some scientists believe the Pleistocene is over and a reason why other scientists believe we are now in an interglacial stage.  Some believe, for example, that since areas of pack ice and glacial ice still exist we are still in an ice age.  Others, on the other hand, seeing the rapid retreat of ice and snow pack in many areas, believes that this period of glaciation has ended.  So, using some other justifications, why do we see some differences in interpretation?  Is there some scientific data available that can support both sides view?  If so, provide it.  Why hasn’t this controversy been solved?  What impact does this division of views have on the public policies that are enacted by state, national and international bodies?

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