The classic way is the examination of the sea floor basalts as they are created at mid-ocean ridges, where the sea-floor spreads and new rock is formed at the ridge. When it cools, it locks into place the magnetic orientation. The rock age is determined by principles similar to those used in carbon-dating, atomic clocks, and medical devices.
Sedimentary particles can be used in areas away from magnetic ridges, allowing for determination of tectonic plate movements.
Is this the same crew that is telling us about global warming, when I look out my window, and see 6-7 inches of snow, single digit temps, and it's been exceptionally cold since early November.
I guess that's sorta the next step from seeing Russia from there, huh? You claim you can see the entire globe?
I hear there was a warming trend in Australia over that same time period.
Or maybe you missed the word "global." You wouldn't be alone--many FReepers do.
