08 NOTES - Sam Krepps 1.17.08 NOTES I Geologic Time A Geologists must deal with time 1 Big Bang 12 billion years ago 2 Earth formed 4.6 billion

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Sam Krepps 1.17.08 NOTES I. Geologic Time A. Geologists must deal with time. 1. Big Bang – 12 billion years ago 2. Earth formed – 4.6 billion years ago 3. Life appears on Earth – 3.5 billion years ago 4. Modern humans (homo sapiens) appear (1) 195,000 years ago 5. Last ice age ended – 10,000 years ago 6. See fig 12.24, p. 443 B. Big Bang 1. Current mass and energy had been all energy packed into on point (1) Occupied no volume 2. No idea why it happened 3. At moment of big bang so much heat that matter cannot form (1) Only energy present C. Expanding universe theory 1. After big bang universe starts to expand (1) Doppler effect (a) If source of an energy wave is moving towards you, waves get compressed. (b) Opposite is inverse. (2) Doppler effect, light waves (a) If light source moves towards you its wavelength decreases = “blue shift” (b) Opposite inverse = red shift (i) Red is largest white wavelength (ii) Galaxies all display a red shift in relation to the Earth 1. Universe is expanding
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This note was uploaded on 04/17/2008 for the course ESCI 221 taught by Professor Price during the Spring '08 term at Millersville.

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08 NOTES - Sam Krepps 1.17.08 NOTES I Geologic Time A Geologists must deal with time 1 Big Bang 12 billion years ago 2 Earth formed 4.6 billion

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