James Ussher (mid 1600's) Georges Buffon (mid 1700s) Lord Kelvin (late 1800's) 75,000 yr 100 m.y. Charles Walcott (1893) 75 m.y. 4004 B.C.
1.Will not take any after next Tuesday 1/13 1.Define each of these terms: You may use your notes and they do not need to be in complete sentences Energy.
