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Describe when contact metamorphism occurs?

Contact metamorphism occurs adjacent to igneous intrusions and results from high temperatures associated with the igneous intrusion. Since only a small area surrounding the intrusion is heated by the magma, metamorphism is restricted to the zone surrounding the intrusion, called a metamorphic or contact aureole

answer a fan shaped mass of sediment deposited at the base of a mountain front do to an abrupt change in stream gradient;