ENV100Y5 Lecture Notes - Lecture 4: Geosphere, Great Oxygenation Event, Chemosynthesis
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ENV100Y5 Full Course Notes
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Document Summary
Better to understand what"s going on than to memorize little facts. Focus on basic concepts, processes, relationships, and orders of magnitude, instead of memorizing details. Terminology is not a detail - it is the basic language of the discipline. Age of sun and solar system - 4. 57 ga (billion years old) Based on models of stellar evolution and dating of primitive solar system objects. Age of earth: 4. 54 ga (300 million years younger than solar system) Based on the ages of terrestrial rocks + age of solar system + models of solar system formation. Few rocks could solidify in the heat of the magma that was round at the beginning of the earth. Ones that did have been weathered, eroded, faulted, etc. which has destroyed most of the oldest rocks. Explains the origin of the solar system. Interstellar cloud inherits elements from previous generations of stars, then: In the centre of the nebula is the high temperature, high pressure zone.
