in the picture above, the dark stripes on the surface of the glacier are: group of answer choices schistosity, formed by metamorphic separation of minerals. sedimentary layering, formed by alternating dusty ice from late winter and clean ice from the rest of the year. medial moraines, rocks picked up from points where tributary glaciers flow together. basal moraines, deposited beneath the glacier. terminal moraines, deposited at the end of the glacier.