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The Dry Valley above-ground surface (a–d) at small-to-landscape scales: (a) surface pavement of rocks and pebbles, (b) visible green algae amidst a larger, drier surface, (c) patchy clumps of algae occurring in moist areas near rocks and (d) landscape of soils, glacier and lake with lake algae that can be blown to soil surfaces. (Photos courtesy of D. W. Hopkins.)
