Claus, this afternoon as I was listening to National Public Radio (NPR, WAMC, Albany, NY) they had a group of scientists there taking questions about many different topics. One caller asked about some photos he had seen of “brown ice and snow” in Antarctica. One scientist said it was from brown algae which grows beneath the more shallow ice where the sun’s UV light penetrates. He even said it will surface and show up as “mud” along stress cracks and breaks in the ice. Hmmm… This may explain the large areas of brown we’ve come across. So now we have red and brown algae - but no green or blue (yet). Still, I’m sure a few photos we seen are indeed remains of volcanic activity.