who were NZ mountains made
Nothing but grey. The mountain ranges that form the backbone of New Zealand are made of ancient greywacke, which is being rapidly uplifted and eroded. Boulders in many of the rivers are made almost entirely of this rock. If you identify a grey rock as greywacke, there is a good chance you will be correct. hard rain. New Zealandâs heavy annual rainfall has helped shape the mountains. More than 10,000 millimetres fall on the western side of the Southern Alps, south of Hokitika. Much of the alps, Fiordland and the north-west ranges receive over 3,200 millimetres.