Most absolute dates for rocks are obtained with radiometric methods. These use radioactive minerals in rocks as geological clocks. The atoms of some chemical elements have different forms, called isotopes. These break down over time in a process scientists call radioactive decay.
hope this helps:)sorry if it doesnt
A boundary is a line that marks the limits of an area; a dividing line. A state boundary is also known as a boarder. Borders are geographic boundaries of political entities or legal jurisdictions, such as governments, sovereign states, federated states, and other subnational entities.
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This page in a nutshell: Summarize in your own words instead of closely paraphrasing. Closely paraphrased material that infringes on the copyright of its source material should be rewritten or deleted to avoid infringement, and to ensure that it complies with Wikipedia policy. Public domain sources and CC-BY-SA-compatible sources may be closely paraphrased, and limited close paraphrasing of copyrighted sources may also be permitted as fair use. Attribution is always required.
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The best way to prevent close paraphrasing is to understand clearly when it is a problem, how to avoid it, and how to address it when it appears.
I think its D or A im not 100% hope im right and it helps you out
