EAS206 Study Guide - Quiz Guide: Silicate Minerals, Chemical Affinity, Asthenosphere

• School: University of Alberta
• Department: Earth and Atmospheric Sciences
• Course: EAS206
• Professor: Chris Herd

Document Summary

We know about the details of the first 10 ma of the solar system from two sources: astronomical observations and studies of primitive meteorites. Astronomical observations show us the sequence of events. Collapse t tauri stage with disk clearing of dust. The planets accreted (growth or increation, typically from adding layers of matter) from planetesimals (a small celestial body that is theorized to have fused together to form the planets in the solar system) Planetesimals: small solid bodies, a few km across, that formed from grain-to-grain accretion of dust. The rich get richer and the poor get poorer . If its large, it keeps sweeping up objects, if its small, it becomes part of the larger object. Keeps doing this until it gets the size of a planet. Terrestrial planets formed from the collision of planetesimals errestrial planets reached nearly their full size within 10 ma (million years) but continued to sweep up planetesimals for another 100 ma.