this colourful ice cave on the kamchatka peninsula in russia was formed by a stream flowing beneath glacial ice which emanates from hot springs associated with a nearby volcano. and because glaciers in the area have been melting in recent years, the roof of this cave is now so thin that sunlight is able to penetrate it, illuminating the cave and colouring it with volcanic ash and organic material trapped in the ice. (x, x, x, x, x)
(via cycloniclops)
