[ERS120H5] - Final Exam Guide - Ultimate 34 pages long Study Guide!
Document Summary
Explosion occurred from a very small point. Density clusters started becoming more dense and creating galaxies. Several years later, chemical bonds were formed as everything was cooled. After the life cycles of stars, nebulas are formed from hydrogen and helium. The nebula starts condensing and a fusion reaction starts. A ball at the center grows dense and hot where it becomes a sun. The planetesimals grows to proto-earth and the interior heats up and. In the rings, dust materials collide and stick together, forming planetesimals becomes soft. The heavier elements move towards the center and the lighter move to the crust. Heat is created from collision and from the decay of radioactive material. Proto-earth collides with a small planet and eventually forms the moon. The moon is a little less dense than the earth. Crust (7-70 km thick: makes up 0. 5% volume of the earth (small area, the crust is the thickest under a mountain range.
