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Subduction of Oceanic Crust creating an Island Arc (BGS-What causes earthquakes?)
Divergent and Transform Plate Margins - Iceland
(MDPI Geosciences)
Formation of the Appalachian Mountains 480mya to 270mya (EARTH Magazine)
Formation of the Appalachian Mountains with captions ( Living Earth)
Formation of the Rocky Mountains (Wiki)
More detail may be found at OpenText-BC - Western Canada during the Mesozoic
How the Rocky Mountains Formed (1:04)
Formation of British Columbia (QMI, 3:29)