Glossary beginning with S
- Sacred sites
- Saguaro cactus
- Salinity
- Sandstone
- Santonian
- Saprophytic
- Savannah
- Scanning Electron Microscope (SEM)
- Scarification
- Scarp
- Schist
- Scoria
- Scree
- Secchi disk
- Sedentary
- Sediment
- Sedimentary Rock
- Seriation
- Serpentine Rock - Outcrop
- Shale
- Sheetflow
- Sherds
- Shoulder season
- Silica
- Silicic magma
- Silt
- Silurian
- Sky Island
- Slick Rock
- Snowshoe Hare
- Soil Horizon
- Speleology
- Speleothem
- Spit
- Spodosol
- Stalactite
- Stalagmite
- Stewardship
- Stock
- Stratigraphy
- Stratocone
- Stratovolcano
- Stream Capture
- Stringer
- Striped Skunk
- Subduction
- Submarine Fan
- Subsidence
- Subsistence
- Subtropical
- Succession
- Superelevation
- Surface Water
- Surficial Deposit
- Symbiotic
- Syncline
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