<Table> <Tr> <Td> </Td> <Td> This article includes a list of references, related reading or external links, but its sources remain unclear because it lacks inline citations . Please help to improve this article by introducing more precise citations . (July 2017) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article includes a list of references, related reading or external links, but its sources remain unclear because it lacks inline citations . Please help to improve this article by introducing more precise citations . (July 2017) (Learn how and when to remove this template message) </Td> </Tr> <P> Continental collision is a phenomenon of the plate tectonics of Earth that occurs at convergent boundaries . Continental collision is a variation on the fundamental process of subduction, whereby the subduction zone is destroyed, mountains produced, and two continents sutured together . Continental collision is known only to occur on Earth . </P> <P> Continental collision is not an instantaneous event, but may take several tens of millions of years before the faulting and folding caused by collisions stops . The collision between India and Asia has been going on for about 50 million years already and shows no signs of abating . Collision between East and West Gondwana to form the East African Orogen took about 100 million years from beginning (610 Ma) to end (510 Ma). Collision between Gondwana and Laurasia to form Pangea occurred in a relatively brief interval, about 50 million years long . </P>

List and briefly describe two types of collisional mountain belts