News tagged with plate tectonics

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Plate tectonics coming of age

(PhysOrg.com) -- Plate tectonics in its current form is believed to have started one billion years ago. A study of two billion year old rocks from African gold mines has now shown that the same process of ...

Nov 24, 2011 5 / 5 (3) 1 | with audio podcast

Half-baked asteroids have Earth-like crust

Asteroids are hunks of rock that orbit in the outer reaches of space, and scientists have generally assumed that their small size limited the types of rock that could form in their crusts. But two newly discovered ...

Jan 07, 2009 4.7 / 5 (3) 2

Earthquake waves: How do they spread?

Propagation of earthquake waves within the Earth is not uniform. Experiments indicate that the velocity of shear waves (s-waves) in Earth’s lower mantle between 660 and 2900 km depth is strongly dependent on the orientation ...

Apr 13, 2009 3.7 / 5 (3) 0