Now if we estimate the age of the sea floor like that, then we get a good agreement with the dates produced by radiometric methods.

It is hard to think that this is a coincidence; it is also hard to think of any mechanism that could produce this agreement other than that the rocks are as old as radiometric methods tell us.

Relative age dating does not provide information about absolute ages, nor does it place rocks and events in chronological order.

Correct Part B What is the principle of original horizontality?

Relative age dating provides information about absolute ages but does not place rocks and events in chronological order.

Relative age dating places rocks and events in chronological order but does not provide information about absolute age.

In this activity, you will be able to combine your knowledge of relative dating methods (learned in Activity 7) with the absolute dating method to determine more accurately the geologic history of a region.

Activity 8 is taken from Investigating Earth: A Geology Laboratory Text (1997) by Wiswall and Fletcher.

What is more, we can measure the rate of spreading directly by GPS, SLR, and VLBI.

This means that if we didn't have any other way of doing absolute dating, we would as a first approximation take the age of basalt on a spreading sea floor to be the distance from the rift divided by the rate of spreading.

This technique does not give specific ages to items.