This USGS site provides a history of seafloor spreading, the evidence for it, and how its discovery led to the theory of plate tectonics. Included is an explanation of magnetic striping on the ocean floor, with several illustrations. Links provide further information.
<a href="http://www.compadre.org/informal/items/detail.cfm?ID=7732">United States Geologic Survey. This Dynamic Earth: Developing the Theory. Sioux Falls: United States Geologic Survey, February 7, 2007.</a>
United States Geologic Survey. This Dynamic Earth: Developing the Theory. Sioux Falls: United States Geologic Survey, February 7, 2007. http://pubs.usgs.gov/gip/dynamic/developing.html (accessed 1 February 2015).
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