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Unit1continetaldrift 3.40MB 2017-03-29 12:41:28
Unit1continetaldrift 3.40MB 2017-03-29 12:41:28

... Wegener’s studies eventually led to the formulation of the PLATE TECTONIC theory. This states that the Earth’s crust is not a continuous skin but a series of rigid, spherical caps about 100km thick. Of these seven are very large and five carry continents. See diagram A on the next sheet. The plates ...
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... 1. Describe the three compositional layers of the earth. 2. Describe the five physical layers of the earth. 3. Explain Wegner’s theory of continental drift. 4. Name four pieces of evidence that supports the theory of continental drift. 5. What provides us with knowledge about the interior of the ear ...
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History of geomagnetism



The history of geomagnetism is concerned with the history of the study of Earth's magnetic field. It encompasses the history of navigation using compasses, studies of the prehistoric magnetic field (archeomagnetism and paleomagnetism), and applications to plate tectonics.Magnetism has been known since prehistory, but knowledge of the Earth's field developed slowly. The horizontal direction of the Earth's field was first measured in the fourth century BC but the vertical direction was not measured until 1544 AD and the intensity was first measured in 1791. At first, compasses were thought to point towards locations in the heavens, then towards magnetic mountains. A modern experimental approach to understanding the Earth's field began with de Magnete, a book published by William Gilbert in 1600. His experiments with a magnetic model of the Earth convinced him that the Earth itself is a large magnet.
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