EVR 1001 Lecture Notes - Lecture 11: Asthenosphere, Subduction, Richter Magnitude Scale
Document Summary
Lithium and other elements formed from the formation of earth. Core, mantle, crust- lighter elements on the outside; sio2 (sand) is a very abundant element. Crust has upper mantle and asthenosphere; lithosphere is outer part of rock. The earth"s geologic cycles: tectonic cycle, rock cycle, soil formation. Convection: heat from earth"s core causes plumes of hat magma to well upward. Hotspots: intra-place locations where molten material from the mantle reach the lithosphere. Plate tectonics: the earth"s lithosphere is divided into plates which are in constant motion. Alfred wegener looked at the distribution of different rocks to develop the theory of plate tectonics. Rocks transform more slowly than the earth moves. The earth is broken up into plates with spreading zones, subduction zones, and collision zones. Earth"s history is measured by the geologic time scale- very long periods of time (10s of millions of years)
