His Ph D thesis was on isotope ratios in meteorites, including surface exposure dating.He was employed at Caltech's Division of Geological & Planetary Sciences at the time of writing the first edition.Technology has progressed phenomenally since Steno's time.Scientists have developed technology that can accurately date rocks using radioactive materials which are fixed into the rocks as they form from sediments.You worked in small groups and as a class to complete the "If Scientists Think. Today's assignment will allow you to compare and contrast your ideas to some of the actual methods scientists used to develop an estimation of the age of the Earth.Following this introduction, there are several links to different sites concerning the methods scientists use to assist them in estimating the age of the Earth.After all, it is possible that rock layers can be disturbed, overturned, and altered in both natural and unnatural ways.
Because this assignment is linked with your work in Assignment 3, you will have "If Scientists Think. Before scientists had modern technology to assist them in their research, they had to use their power of observation to infer the relative ages of the rocks they were studying.
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In Assignment 3, we began exploring the age of the Earth. Through presentation and discussion of individual ideas, the class reached agreements as to the best way to complete each of the prompts.
The Carbon-14 method measures the amount of radioactive carbon-14 in a previously living artifact.
From this information, scientists can accurately infer the age of the test material.