1. Unité des Sciences du Sol, Place Croix-du-Sud 2/10, Université catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium, Department of Earth & Planetary Sciences, McGill University, Montreal H3A 2A7, Canada, Faculty of Forestry and Environmental Management, University of New Brunswick, Fredericton E3B 6C2, Canada, Institute of Public Health, University of Cambridge, Cambridge CB2 2SR, U.K., Dirección General de Geofísica, Instituto Nicaragüense de Estudios Territoriales, Apdo. 2110 Managua, Nicaragua,...