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earthquakes 1 - -oldest rocks are always found on continent...

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Earthquakes august 29 th , 2007. Earthquakes don’t kill people, buildings do. I. Geologic Time i. Relative time. 1. compares which is older based on layering in the ground. 2. Absolute time i. Done by radioactive decay – 1950s. ii. Absolute time scale (# of years before present) 1. time since rock cooled from melt 2. date comes from ratio of apparent radioactive isotope relative to daughter isotope produced by radioactive decay. a. u238 (uranium) -> pb206 (lead) half life of 4.49 x 10^9 years b. c14 -> n14 half life of 5570 years c. k40 (potassium) -> argon40 half life of 1.19 x 10^10 oldest rocks 3.8 Ga (billions of years ago) found in Greenland
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Unformatted text preview: -oldest rocks are always found on continent, not ocean 1. oldest rocks in ocean are only 200 Ma (millions of years) oldest mineral 4.2 Ga found in Australia Earth is 4.6 Ga -age of meteor called carbonaceous chondrile-never heated above 200 degrees Celsius 1. date these rocks that have never been part of planet = 4.6 Ga Mendel 1840s Genetics A. paradigm – all encompassing theory/idea that explains multiple observations and puts into coherent whole. i. Paradigm shift – idea shift ii. Plate tectonics 1. 1965- 10% believed in plate tectonics and its movements 2. 1970 – 98% believed 3....
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