1. chain reaction the splitting of a nucleus into two smaller nuclei whose combined mass is less than that of the original nucleus 2. critical mass the joining of two small nuclei to form one nucleus with a larger mass than the combined mass of the original nuclei 3. fission a self-sustaining reaction that creates an on-going series of reactions 4. fusion the amount of fissionable material required to keep a reaction goin

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.

bal is blood alcohol level. bac will normally be higher in a person with more body fat. so the answer to your question would be, as body fat decreases, the increasing rate of bal decreases.  

c. resource depletion