Îles Salomon (1) Dissolution (1) Development (1) Casualties (1) Observations (1) Observations (1) Hydrothermal alteration (1) Arid regions climate (1) Volcanism (1) Sulfuric acid (1) Sulfates (1) Stone (1) Speleology (1) Sinkholes (1) Physics (1) Physical geography (1) Opals (1) Karst (1) Hydrology, Karst (1) Hot springs (1) Gypsum (1) Frozen ground (1) Climatology (1) Climate (1) Cheek (1) Calcite (1) Speleothems (1) Evolution (1) Losses (1) Ácido sulfúrico (1)