Saturday, 17 November 2012

lithosphere=الليثوسفير


lithosphere=الليثوسفير

WIKIPEDIA:

The lithosphere (Ancient Greek: λίθος [lithos] for "rocky", and σφαῖρα [sphaira] for "sphere") is the rigid[1] outermost shell of a rocky planet. On Earth, it comprises the crust and the portion of the upper mantle that behaves elastically on time scales of thousands of years or greater.

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