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The marked locations have a low population density. Which is the BEST explanation for this fact?
Anthony, E. Pluribus. "File:BlankMap-World-noborders.png." Wikimedia Commons. Wikimedia, 19 June 2006. Web. 3 Feb. 2016. <https://commons.wikimedia.org/wiki/File:BlankMap-World-noborders.png>.
These areas are prone to frequent, large earthquakes.
These areas are very mountainous and difficult to farm and live in.
These areas are experiencing mass emigration due to political upheavel.
These areas are located 30 degrees North or 30 degrees South and receive little precipitation due to the Hadley Cells.
These areas are too hot and dry for agriculture.