GEOS 170A1 Lecture Notes - Lecture 3: Astroid, Meteoroid, Uranium-235
6 Aug 2018
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Document Summary
Things traveling in space haul ass: impacts more common in the distant past, ex: 66 mya, comets: cold astroids traveling in space outside our solar system. Most likely brought some gas and water to earth after cooling: meteorite: remains of meteoroids found on earth & all formed at the time the solar system formed: 4. 6 byo. Magnetosphere - protects gas and water on earth: earth is a dynamo generating magnetism, it holds all the water and gases, earth without magnetosphere = mars (water and gases would be stripped away without magnetosphere) Numerical: earth is around 4. 6 billion years old (really old, oldest layer = at the bottom, tilted layers at the bottom were shifted. Numerical time: atom - building blocks of everything, elements - number of protons (periodic table, isotope - number of neutrons, can lose or gain protons and neutrons, molecule - group of atoms.
