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______________________________________________________________ ____________________________________________________________________ ____________________________________________________________________________________________ _______________________________________________________________ Relative Ages of Rocks: WIki Books (Wiki Books: A project hosted by the Wikimedia Foundation for the creation of free content textbooks) Willard Libby and Radiocarbon Dating.

American Chemical Society A Framework for K-12 Science Education: Practices, Crosscutting Concepts, and Core Ideas (2012), from the National Research Council of the National Academies. Radioactive decay lifetimes and isotopic content in rocks provide a way of dating rock formations and thereby fixing the scale of geological time.

Moreover, the table’s patterns are now recognized as related to the atom’s outermost electron patterns, which play an important role in explaining chemical reactivity and bond formation, and the periodic table continues to be a useful way to organize this information.

The substructure of atoms determines how they combine and rearrange to form all of the world’s substances.

Modern communication, information, and imaging technologies are applications of scientific understandings of light and sound and their interactions with matter.