Lab2_PlateTectonicsSpring2021.pdf - Lab#2 Plate Tectonics...

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Lab #2 Plate Tectonics This exercise will introduce the concept of plate tectonics. The exercises and activities below will cover topics in relation to the theory of plate tectonics, including evidence for the theory, types of plate boundaries and how to calculate rate of movement for these boundaries. Exercise adapted from “Geoworld” Plate Tectonics Lab © 2003 Ann Bykerk-Kauffman, Dept. of Geological and Environmental Sciences, California State University, Chico * Analysis of the present state of Geoworld A. Sea Floor Magnetic Anomalies Geoworld has a magnetic field aligned in a north-south direction. The polarity of this field reverses at random intervals through time, just as the one on Earth does. The history of polarity of the magnetic field is well known for the past 150 million years and is shown by the adjacent magnetic polarity time scale. Shading represents normal polarity (the magnetic field points north) while white represents reverse polarity (the magnetic field points south). Detailed aerial and ship-board magnetic surveys have been conducted over the oceans of Geoworld. Parts of the sea floor have an extra strong magnetic field while other parts have an extra weak magnetic field. Just as on Earth, the areas with anomalously strong magnetic fields are composed of rocks that are magnetized with the same polarity as the current field

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