GG101 Lecture Notes - Lecture 12: Mount Everest, San Andreas Fault, Geologic Time Scale
Document Summary
Chapter 12 + 13 tectonics, earthquakes and volcanism. Endogenic internal pro(cid:272)esses that produ(cid:272)e flows of heat a(cid:374)d (cid:373)aterial deep (cid:271)elow earth"s crust, main energy source = radioactive decay. Exogenic external processes that set into motion air, water and ice all powered by solar energy. Pace of change (largest to smallest) eon > era > period > epoch. Principle of superposition rock and sediment on top are youngest with oldest being at the base as long as it has not been disturbed. Solar syste(cid:373) a(cid:374)d earth are roughly 4. 6 (cid:271)illio(cid:374) years" old. Currently living in holoscene, from now to 11,500 years ago. Recent epoch is time period we are in now. Oldest rock on earth = 4 billion years ago, part of slave craton in northwestern canada. Oldest fossil on earth = 4. 5 billion years old. Radiometric dating half-life, decay rate or time required for one half-life of unstable atoms in a rock sample to decay into daughter isotopes.
