As part of our October Spooky Science series, we've changed our logo to feature Blood Falls, Antarctica! Check out this description, featured in our Spooky Locations with Explanations infographic:
Bitterly cold temperatures, massive glacial valleys, and blood seeping from the earth. The fascinating Blood Falls of Antarctica are a geological phenomenon. Iron salts from trapped salt water lakes under the glacier come to the surface due to freeze-thaws cycles that concentrated the salts and separated them from the water they are dissolved in. The exposed iron oxidizes and “rusts” giving it the blood red color, similar to the red color of our blood that is also caused by oxidized iron. As ice on the surface of the glacier melts the iron salts flow with the melted water, creating a bloody waterfall . Even more fascinating is the discovery of microbes found in the trapped salt lakes under the glacier. It appears that these microbes survived their isolation by “breathing” iron with the help of a sulfur catalyst. This may have groundbreaking implications of biological adaptations for life in other harsh and isolated environments such as space .
Nisar Farhat, CFO, Signal to Noise Magazine
 Ohio State University. Explanation Offered For Antarctica’s ’Blood Falls’. ScienceDaily, (2003).
 Mikucki, J.A., Pearson, A., Johnston D.T., Turchyn A.V., Farquhar J., Schrag D.P., AnbarA.D., Priscu J.C., Lee P.A., A Contemporary Microbially Maintained Subglacial Ferrous “Ocean”. Science 324, 397-399, (2009).