Sandblasting
Sandstone
Schist
Schistosity
Scoria
Sea-floor Spreading
Seamount
Secular Variation
Sedimentary Rock
Sedimentary Structure
Sedimentation
Seismic Discontinuity
Seismicity
Seismic Profile
Seismic Reflection
Seismic Refraction
Seismic Surface Wave
Seismic Transition Zone
Stratification
Stratigraphic Sequence
Stratigraphy
Stratovolcano
Streak
Streak Plate
Streaming Flow
Streamline
Stream Order
Stress
Strike
Strike-slip Fault
Stromatolite
Subduction Zone
Sublimation
Submarine Canyon
Subsidence
Superposed Stream
Superposition, Principle of
Supersaturation
Surf
Surf Zone
Suspended Load
Swash
S-wave
Swell
Symbiosis
Syncline
System (Stratigraphy)