GPS, Radiodating, and Plate Tectonics
The second article by @Joel_Duff to read shows how GPS (which gives us position on the earth), radiodating of ancient rocks (to get their age) work together to show us that the earth looks old. The key forumula is the same we used to date DNA (Heliocentric Certainty Against a Bottleneck of Two?):
Distance equals the product of time and rate. Remember now that the continents were all once joined into a single super continent, Pangea, and then slowly drifted appart. YEC’s agree with this, but think it happened much quicker, in the lifetime of Peleg (Did the Continents Split Apart in the Days of Peleg? | Answers in Genesis)
We can measure the distance between continents (D), and the time that separated using radiodating (T). Those two numbers give us a way to measure how quickly they are moving (R). Now, with GPS, we have an independent way to measure the rate (R). The rate measured by these two approaches matches really well, even though they use different assumptions.
This is just another example of why we say that the earth look old. There is no reason for these estimates to line up unless the continents really did split apart a long time by a process that we still see unfolding right now. Otherwise, this is just an amazing coincidence. The earth really does appear old.