Question

state the age of a given rock if 6.25% of argon is remaining​

Answer 1

Ice Cores and Varves

Several other processes result in the accumulation of distinct yearly layers that can be used for dating. For example, layers form within glaciers because there tends to be less snowfall in the summertime, allowing a dark layer of dust to accumulate on top of the winter snow (Figure 11.23). To study these patterns, scientists drill deep into ice sheets, producing cores hundreds of meters long. Scientists analyze these ice cores to determine how the climate has changed over time, as well as to measure concentrations of atmospheric gases. The longest cores have helped to form a record of polar climate stretching hundreds of thousands of years back.

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