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Geologic dating principles

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The Scottish geologist James Hutton (1726-1797) argued that granite and basalt by solidification within the earth (as opposed to precipitating in from oceanwater).

The units commonly used for geologic age are mega-annum (Ma) for millions of years, giga-annum (Ga) for billions of years, and kiloannum (ka) ka for thousands of years.

To learn how dates obtained from radioactive dating are verified 5.

Have students think about how a calendar works: Why are months so variable in length? Is there a better, more elegant design for a calendar that doesn't have so much variability in the number of days in a month?

Most elements exist in different atomic forms that are identical in their chemical properties but differ in the number of neutral particles— neutrons—in the nucleus.

For a single element, these atoms are called isotopes.