Question

SEP Explain Phenomena Why is the water of Blood Falls red in color? What chemical compound gives the water its red color?
in short

Answer 1

Short: Subglacial brine at Blood Falls is rich in dissolved iron (Fe2+). When it reaches the surface and meets oxygen the iron oxidizes to ferric iron (Fe3+) and precipitates as hydrated iron(III) oxides/hydroxides (rust, e.g. Fe2O3·nH2O / FeOOH), which give the water its red color.