OCS 1005 : Test 1 Geological Study Guide
15 Mar 2019
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Chapter 3: earth structure and plate tectonics: structure of earth (lithosphere, asthenosphere, mantle, etc) crust- earth"s rocky shell. Thickness ranges from two miles in some ocean areas to. 75 miles under mountains. upper mantle- about 400 miles thick. The rigid, topmost 40 miles and the crust form shifting slabs of rock called tectonic plates. lower mantle- nearly 1,400 miles thick. Pressure increasing with depth, makes rocks denser than those in the upper mantle core mantle- mantle rock meets core metal in this transition zone outer core- some. Isostatic equilibrium- balanced support of lighter material in a heavier, displaced supporting matrix. He suggested that all earth"s land had once been joined into a single supercontinent surrounded by ocean (pangaea: radioactive dating- uranium to lead for dating ancient rocks. Radiometric dating- the process of determining the age of rocks by observing the ratio of unstable radioactive elements to stable decay products: convergent, divergent, and transform plate boundaries (what happens to each)
