Cover: In southern Norway, areas such as Storgama, either with shallow, organic matter-rich soils or barren, nutrient-poor, crystalline bedrock correspond to the areas receiving acid precipitation. It is also here that freshwater acidification has been most severe. See Strand et al., "Leaching from Organic Matter-Rich Soils by Rain of Different Qualities: I. Concentrations," p. 547-556. Photo by Gunnar Abrahamsen, Agricultural University of Norway.