The amount of available oxygen at the highest place on Earth is just under 7%. 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? Turn the pages to find out!
The amount of available oxygen at the highest place on Earth is just under 7%. 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? Turn the pages to find out!
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