Quiz:

Earth Quiz: Mysteries of the Blue Marble

Stephanie Pappas, LiveScience Senior Writer
Date: 20 April 2012 Time: 12:10 PM ET
Lifes-little-mysteries
The Earth truly is a planet of extremes, from ice-cold tundra to steamy rain forests, from ocean trenches to snow-covered peaks.
Test yourself on your knowledge of our home planet's wild features.
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Blue Marble Earth
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