The origin of magmas : http://www.tulane.edu/~sanelson/eens211/earths_interior.htm
Lire la suiteThe earth forms http://www.bbc.co.uk/science/earth/earth_timeline http://www.earthhistory.org.uk/wp-content/stratigraphic.jpg
Lire la suitehttp://www.awi.de/en/home/ http://www.ucmp.berkeley.edu/history/wegener.html http://earthobservatory.nasa.gov/Features/Wegener/wegener_7.php © Wegener doc 250 miles = 400 km 38.5 miles = 61 km in 7 days
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