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....
View Full Document
- Fall '07
- Radioactive Decay, oldest rocks, I. Geologic Time, apparent radioactive isotope