Earth Sciences 1022A/B Lecture Notes - Lecture 1: Asthenosphere, Convergent Boundary, Geosphere
9 Apr 2018
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Geology (geo earth, ology study something) the study of earth. Uniformitarianism the present is the key to the past. How long from a scientific point of view billions of years. Where and how: nebular theory 5 b. y. ago solar system, nebula (cloud) of hydrogen and helium contracted under gravity into the flat disc of our, earth formed core, mantle, crust. Plate tectonics - crust and uppermost mantle formed rigid plates of: lithosphere that ride on the, asthenosphere which moves by convection. Believed that africa and south america were together evidence fossils found in both africa and. Pangaea; evidence includes: fit of the continents; good at 900 m, fossils math across oceans. Rocks and structures also match across ocean basins. Ancient climates: find coal fields in today"s cold polar areas, find glacial rocks where glaciers could not exist today. Most geological activity (e. g. earthquakes, volcanoes, landslides) happens at plate boundaries, especially convergent boundaries.
