Answers to questions in: How old is the earth? Quantifying deep time in the 1800's

How can we put numbers on our geologic histories? The basic approach is the backwards extrapolation of a rate of change we can measure, such as rates of deposition, rates of erosion, rates of radioactive decay. An important consideration is how much can the rate vary?

What are input parameters for the equations describing the cooling of a sphere?

What were the false premises in Kelvin's model:

Harmon D. Maher Jr. reserves copyrights to the materials in this site. Material may be used for non-profit educational purposes as long as proper attribution is given. For permission for any other use please contact author. Thank you.

Return to Physical Geology index page.

Return to my home page index.