Many Catholic churches traditionally move St Patrick's Day to another date if March 17 falls during Holy Week. Many immigrants from Ireland fled to other parts of the world, including Australia, Canada, the United Kingdom and the United States, in the 19th and 20th centuries.
Making the world better, one answer at a time. Passive continental margins are not areas of convergence. There is little volcanic and earthquake activity on passive margins. Active margins are areas of convergence where one plate is descending beneath another. They are associated with volcanic and earthquake activity.
The continental arc is formed at an active continental margin where two tectonic plates meet and a subduction zone develops.The magmatism and petrogenesis of continental crust is complicated: in essence, continental arcs reflect a mixture of oceanic crust materials, mantle wedge and continental crust materials.he continental arc is formed at an active continental margin where two tectonic plates meet and a subduction zone develops.