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layers of earth hw2
layers of earth hw2

... 1. (ESRT p.1) What element comprises the greatest percent by volume of the earth’s crust? 2. (ESRT p.1) What is the percentage by mass of silicon in the Earth’s crust? 3. What is the distance from the surface to the center of the Earth? (to the nearest 100 km) 4. Page 15 of your Ref. Tables gives yo ...
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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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