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Evaluating the Evidence for Continental Drift.

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Evaluating the Evidence for Continental Drift There are several pieces of evidence certifying the existence of continental drift. They include mid oceanic ridges, fitting of continents, similarities of fossils on different continents and rock matches. The mid-oceanic ridges rise 3000 meters from the ocean floor and are more than 2000 kilometres wide surpassing the Himalayas in size. The mapping of the seafloor also revealed that these huge underwater mountain ranges have a deep trench, which bisects the length of the ridges, and in places is more than 2000 meters deep. Research into the heat flow from the ocean floor during the early 1960s revealed that the greatest heat flow was centred at the crests of these mid-oceanic ridges. ...read more.


Notice that the patterns on either side of the line representing the mid-oceanic ridge are mirror images of one another. The shaded stripes also represent older and older rock as they move away from the mid-oceanic ridge. Geologists have determined that rocks found in different parts of the planet with similar ages have the same magnetic characteristics. The deepest waters are found in oceanic trenches, which plunge as deep as 35,000 feet below the ocean surface. These trenches are usually long and narrow, and run parallel to and near the oceans margins. They are often associated with and parallel to large continental mountain ranges. ...read more.


The Plants and Animals Match Plant fossils that have been found on several different continents are quite similar. This suggests that they evolved together on a single large landmass. He was intrigued by the occurrences of plant and animal fossils found on the matching coastlines of South America and Africa, which are now widely separated by the Atlantic Ocean. He reasoned that it was physically impossible for most of these organisms to have travelled or have been transported across the vast ocean. To him, the presence of identical fossil species along the coastal parts of Africa and South America was the most compelling evidence that the two continents were once joined. The Rocks Match Broad belts of rocks in Africa and South America are the same types. These broad belts then match when the ends of the continents are joined. ...read more.

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