PLATE TECTONICS
2013-03-08 13:24:14.0 [tbs1979] Move Concepts add broader relation (PLATE BOUNDARIES [4adc15b8-0c18-4ccd-a6ec-75be82df5359,64399] - PLATE TECTONICS [71e9bc66-6f8c-41ec-8b22-2fe390223639,64395]); delete broader relation (null);
PLATE BOUNDARIES
Zones of seismic and tectonic activity along the edges of lithosphere plates, presumed to indicate relative motion between plates.