Continental Drift, the theory that continents move slowly about the earth's surface, changing their positions relative to one another and to the poles of the earth. In the past the theory has been discussed but not generally accepted, most geologists believing the continents to be fixed in place and subject only to vertical movements, such as those observed during mountain uplift. In recent years, however, a sound body of evidence in support of a modified form of the drift theory has been found.
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Lorinda White Feb-09-15 PHS120 Essay 2 1. Cite the lines of evidence Alfred Wegener used to support his idea of continental drift. Why did scientists doubt that continents drifted? Alfred Wegner’s evidence was the way the continents fit together like a jigsaw puzzle, fossils of the same prehistoric species were found where continental drift was expected to be (for example fossils of the same species were found in western Africa and South America), matching mountain ranges, and land features
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Continental drift is happening. Discuss the evidence Continental drift is defined as the gradual movement of continents across the Earths surface through geological time. As early as 1620, Francis Bacon noted the jigsaw-like fit between the east coast of South America and the west coast of Africa. However, it was in 1912 when a German meteorologist, Alfred Wegener, published his theory that all the continents were once joined together in one large supercontinent, which was named Pangaea. Wegeners
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inform my audience about the theory of Continental Drift. Central Idea: My central idea is making sure my audience has a better understanding of the Continental Drift and how the theory was formulated. The Continental Drift Theory` I.(Introduction) For years scientists struggled to explain how similar rocks and fossils were found on continents that are far apart from each other. Until the 20th century when scientist Alfred Wegener's theory of Continental Drift was introduced. A. "Before Wegner
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continents look like pieces of a jigsaw. Alfred Wegner thought that this meant that the continents where moving. They had once been joined together. He looked for evidence which was recorded in their rocks. In 1912 Wegner presented the idea of continental drift and his supporting evidence to a meeting of the Geological Society of Frankfurt. Geologists around the world read the English Translation of his book the Origin of Continents and Oceans which was published in 1922. He found interesting evidence
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continents look like pieces of a jigsaw. Alfred Wegner thought that this meant that the continents where moving. They had once been joined together. He looked for evidence which was recorded in their rocks. In 1912 Wegner presented the idea of continental drift and his supporting evidence to a meeting of the Geological Society of Frankfurt. Geologists around the world read the English Translation of his book the Origin of Continents and Oceans which was published in 1922. He found interesting evidence
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Name of Scientist | Year/Date Discovered | Description of the Inventor | Nicolaus Copernicus(Astronomer) | 1473-1543 | proposed a model of the solar system that involved the Earth revolving around the sun. The model wasn't completely correct, as astronomers of the time struggled with the backwards path Mars sometimes took, but it eventually changed the way many scientists viewed the solar system. | Galileo Galilei(Astronomer) | 1564-1642 | he discovered the four primary moons of Jupiter (now
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Continental drift, sea-floor spreading, and plate tectonics have many similarities and differences. Continental drift is the theory that explains how the continents shift on Earth’s surface. Sea-floor spreading is the process where new sea-floor is created as molten material which rises in the from the Earth’s mantle. Plate tectonics is the theory at which the lithosphere is separated into different plates, and are moving along the asthenosphere. Continental drift, sea-floor spreading and plate
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The continental drift theory was first proposed by a German called Alfred Wenger in 1915. He suggested that the earth’s continents were once joined together, but gradually moved apart over millions of years. This once ‘supercontinent’ was known as Pangea – which translates to ‘’All Earth’’. Pangaea started to break up into two smaller supercontinents, called Laurasia and Gondwanaland, during the Jurassic period. By the end of the Cretaceous period, the continents were separating into land masses
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9/18/12 Oct 2nd first exam! Continental crust: felsic (has most silica), less dense Oceanic crust: mafic, more dense Deep in earth crust you’ll find Diorite. Closer to the surface of the continental crust you’ll find Granite. In earth Mantle: Peridotite, Garnet Peridotite, both are iron rich. Seismic Waves: P Wave: can travel through molten iron (outer core) S wave: cant travel through outer core Outer Core: liquid, iron and nickel Inner Core: solid, iron and nickel
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