GPHY 102 Lecture Notes - Lecture 15: Lithosphere, Tectonic Uplift, The Crust
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The crust: continental crust, lower, denser zone of mafic rock, upper, less dense zone of felsic rock, mafic: rock rich in magnesium and iron. Fesic: rocks rich in silicate minerals, particularly feldspar: oceanic crust, comprised of almost entirely mafic rock, denser than continental crust. Lithosphere: a zone of rigid, brittle rock comprised of the crust and upper part of the mantle (60- Lithosphere is comprised of large plates: because the asthenosphere is soft and plastic, these plates can move over it (temperatures reach. 1400 degrees c: plates separate from each other at one location and collide at others, 19 distinctive plates of various sizes. 3,800 ma) and the hadean eon (3,800 to 4,600 ma) From 542 ma to present is covered in the phanerozoic eon: the phanerozoic is subdivided in three eras- the paleozoic, mesozoic and cenozoic; these eras are subdivided into periods and epochs. 7: spreading/divergent boundaries, away from each other.
