A rock from the moon was found to contain 1.0 
10-5 g of uranium-238 and 4.0 
10-6 g lead-206.All of the lead-206 came from the decay of uranium-238.The half-life for this decay is 4.5 
109 years.How old is this rock?
Definitions:
Graduate Research Project
An extensive study typically undertaken by a student at the graduate level, involving original research or a comprehensive review of existing research on a specific topic.
Randomly Selects
A process of choosing items or individuals without a specific pattern, order, or preference, ensuring equal chance of selection.
Longitudinal Study
A research design that involves repeated observations of the same variables (e.g., individuals) over short or long periods of time, often many years.
Independent Variable
In an experimental setting, the variable that is deliberately changed or manipulated to observe its effect on the dependent variable.
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