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Unformatted text preview: Atmosphere 79% nitrogen, 20% oxygen Much of the oxygen due to life: photosynthesis o Magnetic field Caused by the outer iron core currents produce magnetic field Polarity reverses every 300,000 years Traps most of the energetic charged particles from outer space If we didnt have the magnetic field, these particles would often mutate our cells- wouldnt be conducive to life on earth o Northern and Southern Lights Produced by charged particles hitting our atmosphere o Tides Differential forces of the Moon, mostly Force by Moon on Earth Greatest on near side, smaller on the center, smallest on far side 2 tides per day, not 1 Act as if all of the mass were in the center of the Earth Tides separated by about 12 hours Sun doesnt affect as heavily because it is so much further away Suns differential force is only of the moons...
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This note was uploaded on 04/04/2008 for the course ASTRO C 10 taught by Professor Filippenko during the Fall '08 term at University of California, Berkeley.
- Fall '08