ERTH 2415 Lecture Notes - Lecture 3: Continental Crust, Oceanic Crust, Outer Core
5 Dec 2018
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> most of them coincide with plate boundaries. To move in the same direction as the disk. To have their orbits in the same plane. Lecture #3 **important lecture: tuzo wilson (1908-1993) > earthquakes and volcanoes do not occur at random locations ex: aleutian arch: lots of both. > the sun and planets were born from a rotating disk of cosmic gas and dust, the solar nebula. > the flattened form of the disk constrain the planets: Accretion stages: accretion into miniature planets, collisions between miniature planets to form large planets. Differentiation: process by which gravity causes denser material to gradually migrate to the centre of a planet (density increasing from surface to centre) > thin crust rich in silicon and oxygen. > continental crust is thicker and less dense than oceanic crust. >low-density crust floats on top of the denser mantle. >mantle floats on top of the very dense core.
