obduction ophiolite tectonic schematic subduction emersion oceanic intra
tectonic fault boundary boundaries faults strike learner crack collide interactives grinding earthquakes
tectonic plates shifting billion years drift continental
tectonic tectonics reconstruction geology divisions egu basins
plates plate tectonics tectonic theory convection earth mantle earths move ocean hot mid rises drives ridges material science surface moving
layers earth tectonics crust tectonic igneous mantle geology metamorphic convergent formation earths geologyin geological composition