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The steady rise of greenhouse gases in Earth’s atmosphere caused by human activity is a primary cause for concern because of its ability to potentially bring about additional, larger changes. For humans, the steady movement of the hands on a clock marks off the seconds and the hours.The unstable isotopes change over time into more stable isotopes, in a process called radioactive decay.The original unstable isotope is called the parent isotope, and the more stable form is called the daughter isotope.The movement of the ice across the surface of the planet also scoured deep valleys, created extensive chains of hills known as moraines, and created extensive lakes, including the Great Lakes.

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However, future research should examine the archipelago-wide spatial variability in ΔR with the analysis of additional dated archaeological coral samples.

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In nature, the constant decay of radioactive isotopes records the march of years.

Scientists can use the clocklike behavior of these isotopes to determine the age of rocks, fossils, and even some long-lived organisms.

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