Plate Tectonics Theory Lesson
A middle school lesson on plate tectonics theory for grades 6-8. #KAtalentsearch
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![björk : mutual core - tectonic plates, chords [surrounded]](https://sun9-71.userapi.com/bhQ9doFxt6DtUPVxLAJHa5X79algQAyKtYPswQ/k8wt3cezIOU.jpg)
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