GLY-2250 Chapter Notes - Chapter 11: Canadian Shield, Stony-Iron Meteorite, Oort Cloud
Document Summary
Precambrian includes nearly 90% of geologic time 4. 54 ga hadean, archean, and proterozoic. Eons know little because very little of precambrian rocks are left (less than 20% exposed on surface of earth), many of which are altered by metamorphism. Crato(cid:374)s: large portio(cid:374)s of (cid:272)o(cid:374)ti(cid:374)e(cid:374)ts that ha(cid:448)e(cid:374)"t u(cid:374)dergo(cid:374)e su(cid:271)sta(cid:374)tial te(cid:272)to(cid:374)i(cid:272) defor(cid:373)atio(cid:374) since early paleozoic time. Precambrian shield: largely precambrian portion of a craton that is exposed at earth"s surfa(cid:272)e largest is canadian shield. During hadean eon, earth basically acquired its configuration mantle and crust surrounding core. Ages of the planets and of the universe. Strong evidence that planets formed simultaneously from single disk of material that rotated in same direction as modern planets. Sun formed from material remaining after another star collapsed violently, forming heavy elements. Supernova: exploding star that cast of matter of low density. Solar nebula: dense cloud that remained after star collapsed had some rotational motion when it formed and spun faster as it contracted.
