Earth Sciences 1022A/B Lecture 1: Earth Rocks Sept 15
18 Nov 2015
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Labs start next week (. 00 deposit is due for lab fees) Ology greek means to study something or discourse ( the study of earth ) We can live on it best if we understand it and its functions. Most of our products come from natural materials in the ground. Uniformitarianism the present is the key to the past . Nebular theory 5 billion years ago (the earth formed following the big bang that happened approximately 14 billion years ago) Nebula (cloud) of hydrogen and helium contracted under gravity into the flat disc of our solar system. Earth formed core, mantle, and crust (figure 1. 15 illustrates this formation of the solar system according to the nebular hypothesis from textbook) Crust and uppermost mantle formed rigid plates of Lithosphere that ride on the (latin for rock) Asthenosphere which moves by convention (latin for soft ) Came up with the idea of continental drift . Fit of the continents: good at 900 m.
