Numeric and Relative Dating - Essay Example

There exists no place on earth where we can see the complete geologic column. This is because there is no place on earth where there is the existence of every rock layer in a continuous sequence. 5. Correlation refers to the relationship between two different variables or aspects in a study. In geology, any stratum contains the same type of fossil. Thus, when the same fossil is found in two different strata, the fossils are said to be correlated.6. The fact that in metamorphic rocks the age new minerals can also be determined by radiometric due to metamorphism while in sedimentary rocks one there could be a high likelihood of dating the individual grains of the sediments comprising the rock and not the rock as a whole, Igneous rocks are thus preferred for radiometric dating since both sedimentary and metamorphic rocks cannot be radiometrically dated.7. When an atom with an atomic number of 10 and a mass number of 28 losses two protons and two neutrons from its nucleus,a.

The atomic number after the loss changes to 8. If radioactive decay began with 400,000 parent isotopes, how many would be left after three half-lives?Half-life refers to the time period it takes for half of the parent isotopes to decay. Having begun at 400,000 parent isotopes,First half-life = 400,000/2 = 200,000Second half-life = 200,000/2 = 100,000Third half-life = 100,000/2 = 50,000The answer is B.9. The half-life of a radioactive isotope is 500 million years. Scientists testing a rock sample discover that the sample contains three times as many daughter atoms as parent isotopes.

What is the age of the rock?B. 1,000 million years10. If a radioactive element has a half-life of 16 million years, what fraction of the original amount of parent material will remain after 96 million years? What percentage will that be?Starting with a time of 96 years, a half-life of 16 million years will mean we have 6 half-lives (96/16 = 6)Halving 100% six times gives us 1.56%.