NZ Geographic quoting Peter Crossley
Lava caves may just be the most delightful thing that Aucklanders don’t know about their city—hidden below the suburbs, beneath front lawns and corner dairies.
These caves are formed as a stream of lava begins to cool. The surface of the lava solidifies, but molten rock continues to flow beneath, kept fluid by the insulating crust. More often than not, the tunnel fills up and sets solid, but every now and again, if the flow isn’t blocked, a cave is created. Keep reading…
