The BBC News article Iceland's Okjokull glacier commemorated with plaque about a dead glacier speaks for itself.
However there is a photo in the article that caught my eye.
It shows mountains in the background and some dry flatland in the foreground. While the foreground is sunlit, some areas are shadowed by clouds, and there is what looks like it could be the apex of a rainbow along the ground with the mountains rising behind it.
Question: What might be causing this rainbow-like effect on the ground?
Okjokull sat atop the volcano Ok northeast of the Icelandic capital Reykjavik. Photo: JOSH OKUN