EARTH HISTORY
http://bit.ly/1UJK3IW
Plate tectonics
"This is how it might have happened" - what we think we know
http://youtu.be/lsZq1pNufNg
Isostatic equilibrium
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LIFE'S JOURNEY: like the complex charting of a course on the 'trackless' ocean, heading to a distant port.
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