GEOL 1001 Chapter : Chapter 1
Document Summary
Topics: what is geology, geologic time overview, scientific inguiry, earth as a system, early earth evolution, earths internal and external. The geologic record: geologic time, relative dating: events are placed in their proper sequence or order without knowing their specific age. Australia over 4. 4 billion years old: geologic time scale, eons, eras, periods, epochs, years added after divisions, precambrian 88% time. Earth as a system: components (spheres) interact in the earth system, closed system: movement of energy but no movement of matter in/out of the system, open system: movement of energy ---- The crust: oceanic, 7km, 5 mi, basalt. Igneous rock: relatively homogeneous, continental, 35-40 km, 25 miles, up to 70km or 40 miles, many rock types, average composition is granitic. Peridotite change their structure: lower mantle 660-2900 km, very hot, stronger with depth, d layer: variable layer between lower mantle and outer core.
