GEOSC 010 Chapter Notes - Chapter 22: Snowball Earth, Supercontinent Cycle, Planetesimal
Document Summary
Learning objectives: characteristics that make the earth different, suitability of the position of earth. Earth"s timing allowed for evolution of life and the atmosphere to stabilize. Earth was also impacted by an asteroid that led to the dinosaur extinction and the development of smaller mammals. Learning objectives: major stages of earth evolution. A cataclysmic supernova or exploding stars occurred to have the earth be shaped and formed in the galaxy. A large rotating cloud of dust and gas is called a solar nebula which is how the. The collision of elements eventually collected into a planetesimal. The composition was determined by the proximity to the sun. The continued collisions formed planetesimals into protoplanets and moons. Geologists call the early period of earth"s life hadean. The earth began to convert into a planet with a core, thin crust, and the earth"s middle called the mantle. 22. 3 origin and evolution of the atmosphere and oceans.
