In an unweathered sample of igneous rock,the ratio of an unstable isotope to its stable daughter isotope is 1:15.If no daughters were present at the time the rock cooled below closure temperature,and the half-life of the isotope is 50 million years,how old is the rock? 
Definitions:
Exchange Theory
is a social psychological and sociological perspective that explains social change and stability as a process of negotiated exchanges between parties.
Valued Resources
Assets or commodities that are highly appreciated and sought after within a society or community due to their perceived utility or rarity.
Social Interaction
The process by which individuals act and react in relation to others in a societal context.
"Put-Down" Joke
A form of humor that relies on demeaning or derogatory comments towards a person or a group.
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