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Eng ID Term Definition
4641
sedimentary
(adj.). Formed by the deposition of SEDIMENT.
4642
sedimentary rocks
ROCKS formed by the accumulation of SEDIMENT in water (aqueous DEPOSITS) or from air (eoli­an DEPOSITS). The SEDIMENTS may consist of rock f... more
ROCKS formed by the accumulation of SEDIMENT in water (aqueous DEPOSITS) or from air (eoli­an DEPOSITS). The SEDIMENTS may consist of rock frag­ments or particles of various sizes (conglomerate, sandstone, shale); of the remains or products of ani­mals or plants (certain LIMESTONES and coal); of the product of chemical action or of evaporation (salt, gypsum, etc.); or of mixture of these materials.
4643
sedimentation
The process of breakup and separation of particles from the parent ROCK, their transportati­on, deposition, and consolidation into another R... more
The process of breakup and separation of particles from the parent ROCK, their transportati­on, deposition, and consolidation into another ROCK.
4644
sediment core
See CORE.
4645
sedimentology
The science concerned with the descrip­tion, classification, origin, and interpretation of sediments and sedimentary rock.
4646
sediment trap
A device used to measure the rate and amount of SEDIMENTATION in a location.
4647
seiche
A STANDING WAVE oscillation of an enclosed or semi-enclosed water body that continues, pendulum fashion, after the cessation of the originat... more
A STANDING WAVE oscillation of an enclosed or semi-enclosed water body that continues, pendulum fashion, after the cessation of the originating force, which may have been either seismic, atmospheric, or wave induced.
4648
seismic reflection
The study of the shallower internal structure of the earth by generating acoustic waves and registering their reflection from subsurface lay... more
The study of the shallower internal structure of the earth by generating acoustic waves and registering their reflection from subsurface layers.
4649
seismic refraction
The study of the shallower internal structure of the earth by generating acoustic waves and registering their return at increasing distances... more
The study of the shallower internal structure of the earth by generating acoustic waves and registering their return at increasing distances from the acoustic source, thus detecting waves that have been transmitted along deeper layers of greater elasticity and rigidity.
4650
seismic sea wave
See TSUNAMI.
4651
seismograph
An instrument that records the direction, intensity and TIME of EARTHQUAKES.
4652
seismology
The science and study of EARTHQUAKES, and their causes and effects and related PHENOMENA.
4653
selectivity
The degree of decrease in the RESPONSE of a resonant device with depar­ture from RESONANCE. Selec­tivity determines the ability of a RADIO R... more
The degree of decrease in the RESPONSE of a resonant device with depar­ture from RESONANCE. Selec­tivity determines the ability of a RADIO RECEIVER to differentiate between SIGNALS of different carrier FREQUENCY.
4654
selenotrope
A device used in geodetic SURVEYING for reflecting the MOON's RAYS to a distant point, to aid in long-distance OBSERVATIONS.
4655
self-aligning level
See LEVELLING INSTRUMENT: SELF-ALIGNING LEVEL.
4656
semaphore
Any apparatus for signalling.
4657
semicircular deviation
See DEVIATION.
4658
semidiameter
Half the angle at the observer subtended by the visible disk of a CELESTIAL BODY. SEXTANT ALTI­TUDES of the SUN and MOON should be corrected... more
Half the angle at the observer subtended by the visible disk of a CELESTIAL BODY. SEXTANT ALTI­TUDES of the SUN and MOON should be corrected for semidiameter unless the centre is observed, as with a BUBBLE SEXTANT.
4659
semidiameter correction
A CORRECTION due to SEMI­DIAMETER, particularly that sextant altitude correc­tion resulting from OBSERVATION of the upper or lower LIMB of a... more
A CORRECTION due to SEMI­DIAMETER, particularly that sextant altitude correc­tion resulting from OBSERVATION of the upper or lower LIMB of a CELESTIAL BODY, rather than the centre of that body.
4660
semidiurnal current
See CURRENT.