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Review1pp - The rock cycle Sedimentary environments Atoms...

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Unformatted text preview: The rock cycle Sedimentary environments Atoms made of protons , neutrons , and electrons Atomic number = number of protons ; is unique to each element Process of radioactive decay involves a change in number of neutrons and protons , and a change in atomic mass and/or atomic number. Radioactive elements decay continuously, spontaneously, and at a predictable rate (measured in a laboratory) We can measure the ratio of parent to daughter atoms to determine the age of a rock that contains minerals containing radioactive elements Half-life = Amount of time it takes for half the parent atoms to transform to daughter atoms http://www.talkorigins.org/faqs/dating.html Figure 2. How relative dating of events and radiometric (numeric) dates are combined to produce a calibrated geological time scale. In this example, the data demonstrates that "fossil B time" was somewhere between 151 and 140 million years ago, and that "fossil A time" is older than 151 million years ago. Note that because of the position of the dated beds, there is room for improvement in the time constraints on these fossil-bearing intervals (e.g., you of the dated beds, there is room for improvement in the time constraints on these fossil-bearing intervals (e....
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This note was uploaded on 04/20/2011 for the course GEL 107 taught by Professor Motani during the Spring '08 term at UC Davis.

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Review1pp - The rock cycle Sedimentary environments Atoms...

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