pangea: the world as when it was once together eatrio.net
the great river valley is one of the most earliest civilizations. www.future.org
urban sprawl happens whenever humans expand so big they become cities and the houses slowly building around the big city www.museumofthecity.org
overpopulation happens whenever it is very densely populated in a section for example like Asia. sites.davidson.edu
the fertile crescent is a place where the soil is firm and fertile, in this thing a lot of vegetation photos.travelblog.org
Mesopotamia is a place next to a river, and has the best soil. was established because of the very first settlers; the summerians www.paulsadventures.com
the Siberian land bridge is in Alaska, it was an ice bridge in where people could pass through but it melted away 1.bp.blogspot.com
a pull factor is when people move away from were they where for better opportunities livingdilbert.files.wordpress.com
push factor happens when the economy of from they are living is horrible, or some dictator is pushing them away. 3.bp.blogspot.com
religious persecution happens when your religion is causing conflict in where you live so you are forced to move away
ethnic persecution happens when there's racism c3e308.medialib.glogster.com
the economic factors of migration is poverty www.photosensitive.com
the political factors are things like dictatorship. cdn.breitbart.com
environmental development happens when places lose their resources. static.guim.co.uk
physical formation affects where people migrate because people move to places they think its more adaptable www.smartasset.com
sustainable development is when, life cannot be supported in that area, it need human work in order to keep alive. 3.bp.blogspot.com
migration happens whenever some type of conflict occurs or theirs a problem with the economy farm4.staticflickr.com

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