Group+4+-+Bonus+Activity

Geobiology - MIT Open Course Ware Assignment 1 http://ocw.mit.edu/courses/earth-atmospheric-and-planetary-sciences/12-007-geobiology-spring-2009/assignments/

1. Why is Fe such a strong peak in the cosmic abundance? Why are elements with atomic number greater than 92 not found in nature? Might they once have existed? Why/why not?