Some isotopes, however, decay slowly, and several of these are used as geologic clocks. Dating rocks by these radioactive timekeepers is simple in theory, but the laboratory procedures are complex. <span>All methods rely on the fact that certain elements (particularly uranium and potassium) contain a number of different isotopes whose half-life is exactly known and therefore the relative concentrations of these isotopes within a rock or mineral can measure the age.</span>
Answer:
C. It uses a renewable resources
The answer is people, as this is one of the sculptural
replicas that have been made by Edward Kienholz’s in the beanery. He was able
to make beautiful sculptures and replicas that could also depict aspects in the
life of the modern world.
