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Mynyddoedd plyg. ----- Original Message ----- From: Ceri Williams To: [log in to unmask] Sent: Tuesday, June 28, 2011 7:11 PM Subject: Fold mountains Helo pawb A oes rhywun yn gwybod am derm Cymraeg ar gyfer 'fold mountains'? Y frawddeg rwy'n trio ei chyfieithu yw: 'If one of the plates is made of continental crust then fold mountains such as the Andes in South America will form.' Dyma ddiffiniad o 'fold mountains': Fold mountains are created by uplift and folding of tectonic plates as they move towards each other and collide. This is known as a compressional plate margin. An example is the Andes Mountain range in South America. Buaswn yn gwerthfawrogi unrhyw gymorth. Diolch. Ceri