GEO 1111 Lecture Notes - Lecture 8: Geosphere, S-Wave, Continental Crust

• School: University of Ottawa
• Department: Geology
• Course: GEO 1111
• Professor: Donald Cummings

Document Summary

Geosphere : refractory --> substances with high melting and boiling points ! Things that form rock are refractory ! Elements that are volatile --> organic compounds, and h / he ! Why mountains and oceans --> difference between crusts ! Nucleosynthesis --> formation of elements that we know today : 3 types --> what they entail and what do they produce ! Geological time scale : two time scales ! Can be equated with radiometric dating : radioactive elements as clocks , uranium --> long half life ! Too long and useless for short half life objects : c14 --> relatively short half life and can date organic material ! More effective to date recent materials with it ! Half life --> time it takes fro half of parent isotopes to decay into daughter isotopes : c14 is about 10 half lifes back --> 60000 years !