This preview shows page 1. Sign up to view the full content.
Unformatted text preview: constituents. Mg, Si, Fe and O are the most abundant terrestrial elements. The most common elements in the primordial nebula (based on solar abundances) are H, He,C,O (H 2 O) and N. On Earth the C,N and H 2 O are 10 4 less abundant relative to Mg, Si and Fe than they were in the solar nebula. So the earth, during or since formation, lost a great deal of the volatile material from the primordial nebula. The question is, why did it not lose all in the same process? Is the atmosphere a result of the little that was left, or was this acquired later to a body that was by then volatile-free? There are a number of possible mechanisms by which we could imagine the earth (and other terrestrial planets, or satellites) acquired their atmospheres:...
View Full Document
This note was uploaded on 12/15/2011 for the course AST AST1002 taught by Professor Emilyhoward during the Fall '10 term at Broward College.
- Fall '10