Posted by stephanie on Wednesday, January 18, 2012 at 7:55pm.
Are you asking about a dinner plate or a tectonic plate?
plate tectonics
Tectonic plates move apart at approximately 2.5 cm per year.
http://pubs.usgs.gov/gip/dynamic/understanding.html
(80 * 2.5} / 100,000 = ?
80 years x ____ per year = ____ cm = ____ km
80 years x ____ per year = ____ cm = ____ km
80 years x ____ per year = ____ cm = ____ km
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