GEO307 Ch 2 Notes - GEO307 Chapter 2 I. Age & Timing a....

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GEO307 Chapter 2 I. a. Big Bang – c. 13.7 billion years ago b. Formation of solar system – c. 4.6 billion years ago i. Oldest dated rocks c. 4.1 billion years old ii. Oldest sedimentary rocks c. 3.8 billion years old (signifies presence of oceans) iii. Oldest rocks in oceans 200 million years old c. Radiometric dating – used to estimate how long ago radioactive isotopes existed before decay began (using half-lives) d. Natural time periods (solar day, lunar month) II. Earth’s Surface a. 71% covered by water i. 96% of water on surface is in oceans ii. Remainder mostly frozen/in groundwater b. Average surface temperature 16 degrees Celsius (water = liquid) c. Average oceanic depth – 3800 m d. Average land elevation – 840 m e. Total volume of ocean is about 1/35 x 10^9 cubic km f. Earth’s radius is ?????? III. Oceans a. Water comes from 2 primary sources i. Outgassing from Earth’s mantle ii. Comets b. Residence time i. Water in atmosphere about 11 days
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ii. Water in oceans about 40,000 years
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GEO307 Ch 2 Notes - GEO307 Chapter 2 I. Age & Timing a....

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