CK12 Earth Science

(Marvins-Underground-K-12) #1
(7) http://commons.wikimedia.org/wiki/Image:
Opec_Organization_of_the_Petroleum_Exporting_Countries_countries.png.
GNU-FDL.

(8) http://commons.wikimedia.org/wiki/Image:Hiking_at_Mt._Four_Girls.jpg.
CC-BY-SA 2.5.

(9) http://commons.wikimedia.org/wiki/Image:Gulf_Offshore_Platform.jpg.
CC-BY 2.0.

(10) http://en.wikipedia.org/wiki/Image:USenergy2004.jpg. Public Domain.

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