SKU: 55419209039

The Origin of Continents and Oceans

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The Origin of Continents and OceansSince its inception modern geology has been faced with an important group of problems: explaining parallel formations that are separated by great distances of sea; accounting for isolated life forms in widely separated areas (such as lemurs in Madagascar and India); explaining pre pleistocene glaciations, and similar problems. The usual explanation has been to assume the one time existence of land bridges (such as the hypothetical Lemuria) or

Since its inception modern geology has been faced with an important group of problems: explaining parallel formations that are separated by great distances of sea; accounting for isolated life forms in widely separated areas (such as lemurs in Madagascar and India); explaining pre-pleistocene glaciations, and similar problems. The usual explanation has been to assume the one-time existence of land bridges (such as the hypothetical Lemuria) or parallelisms or diffusion with lost intermediary steps.
In 1915, however, one of the most influential and most controversial books in the history of science provided a new solution. This was Alfred Wegener's Entstehung der Kontinente, which dispensed with land bridges and parallel evolutions and offered a more economical concept. Wegener proposed that in the remote past the earth's continents were not separate (as now), but formed one supercontinent which later split apart, the fragments gradually drifting away from one another. Wegener created his supercontinent with attractive simplicity by tucking the point of South America into the Gulf of Guinea, coalescing North America, Greenland, and Europe, rotating Australia and Antarctica up through the Indian Ocean, and closing the remaining gaps. Wegener then explained various phenomena in historical geology, geomorphy, paleontology, paleoclimatology, and similar areas of science in terms of this continental drift. To back up his revolutionary theory he drew upon a seemingly inexhaustible find of data. Later editions of his book added new data to refute his opponents or to strengthen his own views in the violent scientific quarrel that arose.
Even today this important question remains undecided, and geologists are divided into strongly opposed groups about the Wegener hypothesis. At the moment it seems to be gaining steadily in acceptance. It is one of the two basic theories of earth history, and since it has often been misrepresented in summary, every earth scientist owes it to himself to examine its theories and data.



Binding Type: Paperback
Publisher: Dover Publications
Published: 12/14/2011
ISBN: 9780486617084
Pages: 272
Weight: 0.71lbs
Size: 8.50h x 5.50w x 0.58d

Review Citations: Booklist 12/01/1999 pg. 677
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SKU: 55419209039

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Jeannie
Lake Worth, US
★★★★★ 5
big dogs matter
Color: 10PC-Beef-Red
bundle of 10 for 9 hard chewers - works for our family
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Reviewed in the United States on March 26, 2026
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BeauKnws
Charlottesville, US
★★★★★ 5
We figured it out!
Color: 6PC-Peanut Butter-Orange, Color: 6PC-Peanut Butter-Orange
My pup wasn't quite sure what to do with it at first. It did take me a few minutes to get him to figure it out. I just kinda toyed with it like I would a rope or a toy around his mouth and once he grabbed it, I pulled it away making him wanting to grab it again and take it from me... Once he finally took hold of it firmly, that was it, we were off and running! It's definitely a super hard chew toy, so I surely would not recommend it for a soft jaw dog. But if your dog is like mine, with super crushing power, then this is the right fit!
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Reviewed in the United States on May 21, 2026
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Katie Taylor
Houston, US
★★★★★ 1
Dog did not like it
Color: 6PC-Beef-Red
Not impressed at all. My dog is a toy and bone hoarder. She does not touch these bones at all, it sits there all day while she grabs all her other “treasures”
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Reviewed in the United States on May 14, 2026
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Teresa Goode smith
Waukegan, US
★★★★★ 5
Great we'll worth
My bullys love these and they last forever well worth my money
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Reviewed in the United States on June 12, 2025
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Kindle Customer
New York, US
★★★★★ 5
Nice sturdy toy
Size: Large (5" x 3.25" x 9")
VERY STURDY
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Reviewed in the United States on June 7, 2026

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