EAR 117 Lecture Notes - Lecture 2: Seismic Wave, Greenwich Mean Time, Radioactive Decay
10 Sep 2016
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Document Summary
Origin of the universe: hubble space telescope, big bang model, stars, galaxies, and clusters. Origin of our solar system: collapse of a rotating interstellar cloud, accretion to form planets. Extraterrestrial oceans: liquid oceans on jupiter"s moons, europa and callisto. Early planet earth: separation of dense and lighter. Contraction due to nebular gravity: equal in all directions. Spin= centripedal force outstand: greatest at equator, zero at axis. Laws (from observation) of: cross cutting relationships- older is cut by younger, superposition, original horizontality, lateral continuity : same sequence. Isotope: flavor of atom, sable/unstable: atom has protons, neutrons, electrons, normal atom has equal #"s of p, n, e. Radioactive parent isotope: radioactive decay of parent to daughter isotope is constant in rate (law of physics, quantum mechanics, if a crystal (closed system) has a parent material that decays at a constant rate. Time required for parent to decay to daughter: half-life (constant) Age of earth> radiometric dating> 4. 5-4. 6 bill years.
