und  search
Unda Russian Federation  search
BTCommonwealth of Independent States
 .Russian Federation
 ..Chita Russian Federation
 ...Unda Russian Federation
SNVillage in S Chita Oblast in Transbaikalia. Before 1993, Unda Russian Republic was also used. This term has multiple hierarchies.
undation  search
RTcrust
 crustal thickening
 tectonics
underclay  search
UFcoal clay
 root clay
 seat clay
 seat earth
 underearth
RTclay
 fireclay
 coal seams
underearth  search
USEunderclay
underground  search
SNA valid term through 1977. After 1977, use underground space.
underground cavities  search
RTcaverns
 caves
 solution cavities
 geomorphology
 underground space
 volcanic features
SNUse solution cavities if applicable. Also see underground space for engineering geology. Added to Thesaurus in 1993.
underground channels  search
RTchannels
 drainage
 infiltration galleries
 irrigation
 ground water
 underground installations
 waterways
SNAdded to Thesaurus in 1981.
underground disposal  search
UFunderground waste disposal
RTwaste disposal
 radioactive waste
 waste disposal sites
 waste management
 underground installations
 landfills
 far-field
 near-field
 underground storage
 underground storage tanks
SNAdded to Thesaurus in 1985.
underground installations  search
UFinstallations, underground
RTmines
 land subsidence
 seismic response
 rock mechanics
 permafrost
 geologic hazards
 seepage
 design
 construction
 feasibility studies
 foundations
 excavations
 pipelines
 leaking underground storage tanks
 far-field
 near-field
 gas storage
 oil storage
 site explora
SNUsed for geological studies on underground cavities (natural or otherwise), excluding tunnels.
underground mines  search
USEunderground mining
underground mining  search
BTmining
 .underground mining
UFsubsurface mining
 underground mines
RTmines
 mining geology
 cut-and-fill mining
 longwall mining
 underground installations
 roof control
SNAdded to Thesaurus in 1982.
Underground Research Laboratory  search
RTLac du Bonnet Batholith
 Pinawa Manitoba
 waste disposal
SNCanada's URL is located at (N50#DG15'W095#DG50'), about 10 kilometers north of Pinawa Manitoba, Whiteshell Research Area, W end of Whiteshell Provincial Park. In the Lac du Bonnet Batholith, it is site of nuclear waste disposal investigations. May occur i
underground space  search
UFspace, underground
RTland use
 underground cavities
 underground installations
 underground storage
underground storage  search
UFsubsurface storage
RTwaste disposal
 underground installations
 storage
 leaking underground storage tanks
 far-field
 near-field
 underground disposal
 gas storage
 oil storage
 underground storage tanks
 high-level waste
 low-level waste
 Stripa region
 underground space
SNAdded to Thesaurus in 1982.
underground storage tanks  search
RTgas storage
 gasoline
 leaking underground storage tanks
 oil storage
 petroleum products
 storage
 underground disposal
 underground storage
 waste disposal
SNUse leaking underground storage tanks if applicable. Added to Thesaurus in 1995.
underground streams  search
RTcaverns
 caves
 exsurgence
 hydrogeology
 hydrology
 karst
 resurgence
 springs
 streams
 tributaries
 geomorphology
 ground water
 unsaturated zone
SNAdded to Thesaurus in 1982.
underground waste disposal  search
USEunderground disposal
underground water  search
USEground water
Underhill Formation  search
RTLower Cambrian
 Neoproterozoic
 Vermont
SNIndexed with ages as applicable. Added to Thesaurus in 1989.
underplating  search
UFsubcretion
RTextension tectonics
 plate tectonics
 rifting
 accretionary wedges
 active margins
 subduction zones
 lithosphere
 continental crust
 oceanic crust
 underthrust faults
SNUsed to refer to different concepts in plate tectonics: In areas of rifting and thinning of continental crust, used to describe emplacement of basaltic magma at the base of the continental crust. In oceanic subduction zones, used to refer to accretion of
underpressure  search
RTfluid pressure
 hydrostatic pressure
 pore pressure
 pressure
 reservoir properties
underthrust faults  search
BTfaults
 .underthrust faults
RTunderplating
SNBefore 1978, search underthrust AND faults.
UNDP  search
UFUnited Nations Development Programme
RTassociations
 United Nations
SNAdded to Thesaurus in 1981.
undulatory extinction  search
RTmicroscope methods
 optical extinction
SNAdded to Thesaurus in 1981.