ENV100Y5 Lecture Notes - Lecture 6: Interstellar Cloud, Nebular Hypothesis, Segesta

• School: UTM
• Department: Environment
• Course: ENV100Y5
• Professor: Barbara Murck

Document Summary

Chapter 2 - earth as a planet. Friday, september 18, 2015. Orders of magnitude, concepts, processes, relationships. Terminology is not a detail. And link to quizlets that has flashcards. The time scale of earth history. Age of sun and solar system ~ 4. 57 ga (giga (billion) annum) Based on models of stellar evolution and dating of primitive solar system objects. Carbonaceous chondrites (meteorites) (don"t need to know) Meteorite struck in new mexico (name = iyanday) Condoles - droplets of what was around the solar system at the time. Age of earth ~ 4. 54 ga. Based on ages of terrestrial rocks + age of solar system + models of solar system formation. Oldest rock is = 4 ga old - acesta gineiss (found in canada) Tens of millions of years of a diff between 4. 57 and 4. 54 ga. We know based on ages of terrestrial rocks. Plate tectonics (crust being recycled). Weathering, is very dynamic and breaks a part rocks.