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Author
Series
Accelerated Reader
IL: MG - BL: 5.2 - AR Pts: 1
Lexile measure
940L
Language
English
Formats
Description
The amount of oxygen available at the highest place on Earth is just under 7 percent. Explorers risk their lives and test their lungs traveling to these great heights atop mountains. Who are these adventurers and why do they do it?
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