A teacher-created Geography lesson on population movement. He discusses the push and pull factors that drive people to leave a place and move to a new place, and how some migrations are voluntary, while others are involuntary or forced....

A teacher-created video that focuses on the push and pull factors and intervening obstacles that impact upon why people migrate. [12:49]

Last in a series of videos on human prehistory, this video describes how human populations from different geographical regions have reunited in the modern era. [2:45]