Gondwanaland and Laurasia |
Donovan exposes his tenuous grasp of earth science in the very first paragraph, when he opines that
"Earth is one of the most geologically interesting celestial bodies because of its ever-changing surface and mysterious past."
How Sak has determined that only Earth, among all the "celestial bodies," is the only one with a changing surface totally escapes us. Clearly, he's making a reference to plate tectonics; but planetary scientists are pretty sure that Mars had plate tectonics some time in the past, and that Jupiter's moon Europa is tectonically active today. But they aren't "interesting," we guess... Sak's further observations include,
"Throughout Earth's history many unique supercontinents spring up, and all of them never witnessed by a human eye. While continental drift occurs quickly in a geological sense, it does not compared to human lifespans."
Duh... not just the "never witnessed" crap, but also the implication that supercontinents "spring up" as if they were seedlings on a warm summer day. Perhaps it has something to do with his inability to comprehend just how long a couple of a billion years would last! Donovan then goes on to list the supercontinents historical geologists have identified and/or postulated over the years. In order, according to Sak, they are Vaalbaara, Ur, Kenorland, Columbia, Rodinia, Ponnotia, Pangaea.
Duh. If Donovan insists on rewording wikipedia articles, you'd think that he'd do a better job; e.g.
Our geology guy did find Donovan's illustrations amusing, including "...a picture of what Vaalbaara would be when it was just starting..." It's an image of the dome-shaped stromatolites you can find at Australia's Shark Bay. Cute...
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Of course, Sak's post also alludes to future supercontinents, so he scraped some images and videos purporting to show what the planet's surface will look like 100-250 million years in the future. He does not, however, provide citations...
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