GEOL 1250 Lecture Notes - Lecture 3: Olivine, Solar System, Bulk Density
25 May 2016
School
Department
Course
Professor
Document Summary
How deep can we drill - 4-5 km, Deepest hole - 17km (halfway through the crust) This shows that the crust is very deep, and there is no way to actually know the chemical compositions by digging to the mantle. Big chunks of rocks not part of magma - part of the mantle. Similar to earth in metal and rock. We know the chemical makeup by looking at the light. Earth"s composition is of the sun minus hydrogen and helium. Planet atmosphere - temperature of the surface of the planet and gravitational attraction (the bigger the planet the higher the gravitational attraction) Solar system began 4. 4 billion years ago. From huge rotating clouds of gas that contracted and flattened. As the cloud contracts, the temperature goes up and rotations get faster as it spins and flattens. Accrete - dust collide with each other, forming larger and larger rocks. Chondritic meteorites - most common, same chemical composition.
