subsurface
Beneath the exterior
Subsurface refers to what lies beneath a surface, especially underground or underwater.
The word functions as both adjective and noun: subsurface mining, subsurface water, conditions in the subsurface.
It appears frequently in geology, engineering, and environmental science when discussing what can't be seen from above: Radar revealed subsurface structures.
Enclosed underground route
- cavernLarge natural underground chamber
- caveUnderground hollow in rock
- mineOre excavation site
- bunkerReinforced subterranean stronghold
basement · cellar · burrow · subway · sewer · aquifer · catacomb · crypt
Single thickness of material
- stratumHorizontal layer of material
- horizonApparent earth-sky meeting
- sedimentParticles settling in liquid
- topsoilNutrient-rich surface earth
subsoil · clay · silt · sand · loam · humus · permeability · porosity
Covering or wrap
- crustHard outer layer
- lithosphereCrust plus upper mantle
- tectonicsStudy of crustal deformation
- bedrockSolid stone underground
faults · folds · strata · formation · basalt · granite · schist · metamorphic
Relating to ground tremors
- sonarUnderwater detection by echoes
- boreholeDrilled underground passage
- drillingHole-making by rotation
- geophysicsPhysics of planetary structure
prospecting · surveying · geotechnical · reservoir · petroleum · hydrology · mapping · tomography
Act of unearthing
- stratigraphyStudy of rock layers
- artifactHuman-made historical object
- burialPlacing deceased underground
- middenHistorical domestic refuse pile
foundation · ruins · settlement · deposit · feature · context · fill · pit
Placed beneath earth
- concealedMade invisible deliberately
- underlyingExisting beneath the surface
- latentPresent but inactive
- undetectedNot discovered yet
invisible · obscured · submerged · embedded · unseen · deep-seated · covered · interred
tunnel
Enclosed underground route
bunker · basement · cellar · burrow · subway · sewer · aquifer · catacomb · crypt · sinkhole
layer
Single thickness of material
- stratumHorizontal layer of material
- horizonApparent earth-sky meeting
- sedimentParticles settling in liquid
topsoil · subsoil · clay · silt · sand · loam · humus · permeability · porosity · compaction
mantle
Covering or wrap
- crustHard outer layer
- lithosphereCrust plus upper mantle
- tectonicsStudy of crustal deformation
bedrock · faults · folds · strata · formation · basalt · granite · schist · metamorphic · igneous
seismic
Relating to ground tremors
- sonarUnderwater detection by echoes
- boreholeDrilled underground passage
- drillingHole-making by rotation
geophysics · prospecting · surveying · geotechnical · reservoir · petroleum · hydrology · mapping · tomography · magnetometry
excavation
Act of unearthing
- stratigraphyStudy of rock layers
- artifactHuman-made historical object
- burialPlacing deceased underground
midden · foundation · ruins · settlement · deposit · feature · context · fill · pit · posthole
buried
Placed beneath earth
- concealedMade invisible deliberately
- underlyingExisting beneath the surface
- latentPresent but inactive
undetected · invisible · obscured · submerged · embedded · unseen · deep-seated · covered · interred · sunken
tunneling
Digging underground passages
mining · drilling · shoring · underpinning · cut-and-cover · earthwork · dredging · quarrying · grading · caisson
- undergroundunderground, subterranean, cave systems, tunnels, tunnel
- depthsabyss, deep, bottom, chasm, fathomless
- levelslevel, tier, layer, floor, story
- oil industrypetroleum, oil fields, oil well, oil rig, oil production
- Earth's interiorcrust, mantle, core, inner core, outer core
- depth levelsshallow, deep, bottom, underground, subterranean
subsurfacesurface
Outermost boundary layer
aboveground · overhead · aerial · topside · atmospheric
surface, resurface, surfaced, surfacing, resurfaced, resurfacing, resurfaces, surfy