GEOG C82 Chapter Notes - Chapter 2-8: Halocline, Continental Rise, Continental Margin
Document Summary
Lectures 2-8: earth history, plate tectonics, earth math, water properties: origin of matter = elements, of all visible matter in the universe a. i. 2% heavier metals that dominate in us and in earth a. iii. 1. All heavier elements are result of nuclear fusion of lighter ones: hydrogen and helium formed just after the big bang (13. 7 billion years ago) c, heavier elements formed in stars stellar nucleosynthesis. Lithium, beryllium, boron form in cosmic radiation d. i. Up to iron in massive stars: very heave elements form in supernova explosions supernova nucleosynthesis, origin of stars, condensation theory: explains how stars and planets are believed to form. Stars form in nebulae large diffuse clouds of dust and gas within galaxies. Diffuse area of a spinning nebula beings to shrink and heat up under influence of own weak gravity. Cloudlike sphere flattens and condenses at the center into a knot of gases protostar. Gravitational energy causes it to contract compression increases internal temperature.
