GEO 303 Study Guide - Midterm Guide: Closure Temperature, Strontianite, Magma Chamber
Document Summary
Earliest meteorite date to 4. 567 ga (billion years ago) - bits from solar system formation and pieces of asteroids. Widmanstatten pattern - formed on iron-nickel alloys at temps between 700 to. 450 celsius and cool at 0. 01-0. 0001 celsius per year so they take million years to form. Radioactivity - nature"s timer decayed some minerals and rocks early in the solar system. Rocks collected from the apollo mission dated to around 4. 5 ga (billion years) Zircons found in australia from the ancient continental crust dated back to about. Oldest intact rocks are approx 4 ga. Universe is much older than the earth. Educated guess based on the velocity and distance of the galaxies as the universe expands like a balloon. Redshift tells us that the universe is growing in size. Edwin hubble - all galaxies seemed to be moving away from each other with the most distant. Doppler effect to explain the expanding universe red shift .
