• Soil sciences

• Desert soils
• Laterites
• Saline soils
• Unsaturated soils
• Volcanic soils

• Minerals
• Permafrost
• Plant nutrition
• Rocks
• Soil maps
• Soil mechanics
• Soil moisture
• Soil pollution
• Soil resources
• Soil surveys
• Soil water

• Soil classification
• Soil types

• Science > Earth sciences

http://vocabularies.unesco.org/thesaurus/concept14174