Finally, another major piece of evidence he found was that if the continents were together like in Pangaea, the mountain ranges would line up. I strongly agree with his theory for many reasons that I will explain. At the time little was known about the nature of the sea floor and this made it difficult to explain the movement of the continents. Pangaea began to break up around 200 million years ago with the separation of Laurasia from Gondwana, and the continents we know began to take shape in the late Jurassic about 152 million years ago. Of course, possible explanations are brought to attention.
The continents then shifted due to plate tectonics which states that the continents shifted along with the earths crust. And decades later, scientists would confirm some of Wegener's ideas, such as the past existence of a supercontinent joining all the world's landmasses as one. Seafloor spreading is most dynamic along giant underwater mountain ranges known as s. Pangaea began to break up around 200 million years ago, with the separation of Laurasia from Gondwana, and the continents we know began to take shape in the late Jurassic —about 152 million years ago. The following excerpt from an article in the journal Geografiska Annalerdiscusses the potential effects of plate tectonics on land-mass area, ocean currents, and Earth's heat budget. Then the continents drifted apart into the places they are now today.
The original land mass was named Pangaea and it was suggested that this broke up into the northerly Laurasia and the southerly Gondwanaland see illustration. Wegner's hypothesis met with wide skepticism but found support and development in the work and writings of South African geologist Alexander Du Toit who discovered a similarity in the fossils found on the coasts of Africa and that were seemingly derived from a common source. In this diagram it shows Wegeners idea of how the continents must have been together due to the same fossils being found on different continents around the world. He proposed in 1931 that the contained convection cells that dissipated heat and moved the crust at the surface. The theory was finally considered when a study showed that seafloors were moving by a few centimeters every year. According to Holmes it was this heating and cooling cycle that caused the continents to move.
The tearing apart of Pangaea produced long valleys that ran roughly parallel to the east coasts of the Americas and the west coasts of Europe and Africa. These trenches extended down over 11km e. Technological advances necessitated by the Second World War made possible the accumulation of significant evidence regarding Wegener's hypothesis, eventually refining and supplanting Wegner's theory of continental drift with modern plate tectonic theory. Explanations of that persisted well into the twentieth century made the improbable geophysical assertion that the continents moved through and across an underlying oceanic crust much as ice floats and drifts through water. The young complete their development outside the mother's body, attached to a nipple.
These plates are on top of a layer of hot rock that moves very slowly. At one time —estimated to be 200 to 300 million years ago —all of the continents were united in one supercontinent or protocontinent named Pangaea or Pangea, from the Greek pan, meaning all, and gaea, meaning world that first split into two halves. His most recent work concerns a new theory of knowledge as intrinsically historical. Geologists assume that, for the 100 million years that Pangaea existed, the climatic zones were the same as those operating today: cold at the poles, temperate to desert-like at the mid-latitudes, and tropical at the equator. Many of the invading northerners, such as the llama and tapir, died out in North America and are now found only in the south.
In my eyes, his theory is probably the only thing logical enough for me or even the rest of the world to believe, because it just makes so much sense. Pangaea: 1 The tidal forces as invoked by him are not sufficient enough to drift the continents so apart. These mountains were formed when the North American plate crashed into the European plate. Building from what Wegener had started, plate tectonics were discovered. To answer the 'how,' it would be due only to subtle changes over many years. My second reason proving that his theory is correct, is that the 6 major plates of the world could have moved the contents to there current location. Four fossil examples include: the Mesosaurus, Cynognathus, Lystrosaurus, and Glossopteris.
The are formed as two continental plates collide. The Map That Changed the World: William Smith and the Birth of Modern Geology. Wegener's theory of Continental Drift predated the theory of. It has also been mentioned that despite being widely spread apart, living animals are similar to one another. The relative movement of continents is explained by the movement of lithospheric plates—of which the visible continents are a part—over the athenosphere the molten, ductile, upper portion of Earth's mantle. A major theorist of continental drift, and certainly the one who gave the hypothesis scientific plausibility, was Alfred Wegener 1880—1930.
Under the sea where the Earth's crust is relatively thin but dense and the plates are moving away from one another, new crust is formed at spreading ridges as lava flows from the upper mantle. Also was the jigsaw-fit of the continents Wegener's theory is Continental drift- The Earth once had a single landmass that broke up into large pieces, which have since drifted apart. Meanwhile, dinosaurs, mammals , and other organisms evolved as they mingled across the connected Earth for millions of years, responding to the changing climates created by the shifting landmass. Evolution and Biological Diversity Early explorers, mapmakers, and traders were often accompanied on their travels by naturalists people who studied all the natural sciences. Wegener had no convincing explanation for why the continents might move about, which counted against his view.