Over 70% of the rocky surface of our planet (although most of this is underwater) is made up of oceanic crust.  This crust, along with the upper mantle make up the oceanic tectonic plate material.  Oceanic crust is unique - and this episode explains the features of this type of crust.This is essential listening for students learning about Plate Tectonics!For more GEO Podcasts and Earth science education materials, visit us at GEOetc.comSupport the show (https://www.buymeacoffee.com/Geoetc)