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Portages can be many kilometers in length, such as the 19-kilometre (12 mi) [https://en.wikipedia.org/wiki/Methye_Portage Methye Portage] and t

...d fades into space. Three quarters of the atmosphere's mass is within 11 [[Kilometre|km]] of the [[planet]]ary surface. In the [[United States]], people who tra

...]. It covers an approximate area of [[1 E12 m²|2.5 million]] [[square kilometre|km²]] (965,000 [[square mile|sq mi]]), but its connection to the ...kilometre|km²]] and the Eastern Mediterranean about 1.65 million [[square kilometre|km²]].

...e declines steadily with altitude, and has a [[scale height]] of about 8 [[kilometre]]s at the Earth's surface: the height at which the atmospheric pressure has