31 MAY 2012 by ideonexus

 The Impossibility of Continental Drift

Even more difficult to explain, than the breaking-up of a single mass into fragments, and the drifting apart of these blocks to form the foundations of the present-day continents, is the explanation of the original production of the single mass, or PANGAEA, by the concentration of the former holosphere of granitic sial into a hemisphere of compressed and crushed gneisses and schists. Creep and the effects of compression, due to shrinking or other causes, have been appealed to but this is hard...
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It does sound crazy on the face of it.

01 JAN 2012 by ideonexus

 How Radiometric Dating Works

Briefly, a radioactive isotope is a kind of atom which decays into a different kind of atom: for example. one called uranium-238 turns into one called lead-206. Because we know how long this takes to happen, we can think of the isotope as a radioactive clock. Radioactive clocks are rather like the water clocks and candle clocks that people used in the days before pendulum clocks were invented. A tank of water with a hole in the bottom will drain at a measurable rate. If the tank was filled at...
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A great summary of how we date fossils using Uranium and Carbon atoms and their decay rates.

11 APR 2011 by ideonexus

 We Exaggerate the Magnitude of Ice Ages

The history of Earth's climate is one of the more compelling arguments in favour of Gaia's existence. We know from the record of the sedimentary rocks that for the pst three and a half aeons the climate has never been, even for a short period, wholly unfavorable for life. Because of the unbroken record of life, we also know that the oceans can never have either frozen or boiled. Indeed, subtle evidence from the ratio of the different forms of oxygen atoms laid down in the rocks over the cours...
Folksonomies: ice ages geology epochs
Folksonomies: ice ages geology epochs
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Ice Ages did not encroach on over 70 percent of the Earth's surface, meaning they were not as significant of an event as we tend to imagine them.