WATCH: River of rocks flows in New Zealand

Incredible video shows river of flowing ROCKS in New Zealand after cyclone Gita strikes...

This incredible video shows a river of rocks flowing down a gorge in New Zealand after they were dislodged by Cyclone Gita. The phenomenon, known as ‘granular flow’ was filmed at Terrible Gully near Canterbury in the aftermath of the tropical storm.

It happens when rocks of a similar size, in this case greywacke, are thrown together in large numbers down an incline, causing them to act like a liquid.