In 2007, there were more people living in ____ than ____ areas. ____ is defined as the ____ in the proportion of people living in cities compared to rural areas. The causes for people ____ cities are called ____ ____ are locations with more than ____ people. The clearing and rebuilding of inefficient ____ areas is known as urban ____. Migration can be the result of environmental factors such as rising ____, loss of ____, access to safe ____, and access to ____.

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