ESC 1000 Lecture Notes - Lecture 38: Volcanic Gas, Outgassing, Banded Iron Formation
Document Summary
Spread solar material throughout the universe spread by stellar winds. Disc spins due to conservation of angular momentum. Formed by condensing from a nebula (nebular hypothesis) Solar system (including earth) condensed by a rotating nebula. 1)stars & planets form when gravity pulls gas, dust, and ice together to form a swirling disc. 3)rings around the star condense into planetesimals which combine to form planets. Planet composition is dependent on the distance from the sun during formation, so this results in planets with varied composition. Planetary densities in the four closest to the sun have high metal and rock content, there"s a much larger proportion of ice and gas in the planets farther from the sun. Roughly the same age as our solar system (4. 5 billion years old) Heat from impacts and radioactive decay remelt most (or even all) of the earth. Dense metals pulled toward the center as lighter, low-density minerals "floated" outward and to the surface.
