Evidence then that these boundaries were very

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Unformatted text preview: vity (e.g. earthquakes) Fossils were another piece of evidence: similar fossils were found on opposing continental coasts Magnetic anomalies: The switching of the magnetic field changes the magnetic field of rock. The polarity of the ions in the rock are fixed by the magnetic field in the position of the time. The polarity of the earth can be seen in the switches of the rock layers. The magnetic anomalies are parallel to the mid- oceanic ridges Can also tell us...
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This document was uploaded on 03/23/2014 for the course BIOL 403 at Georgetown.

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