Table 5.9 — ECs with labels beginning with E
Label Concept definition Figure(s) Code
EARLY_WARNING_RADAR_SITE A <FACILITY> utilizing long-range radar to detect approaching <AIRCRAFT> and/or <MISSILE>s; an early warning radar site.   361
EARTH The primary <PLANET> of the <SUN> that is third in distance from the <SUN>, with an orbital mean <<RADIUS>> of approximately 149,6 million kilometres; Earth.   362
EDDY A circular movement of fluid running contrary to the main flow, usually formed where <CURRENT>s pass obstructions, between two adjacent <CURRENT>s flowing counter to each other, or along the edge of a <CURRENT> that is <<PERMANENT>>; an eddy.   363
EDDY_REGION A <REGION> where <EDDY>s occur.   364
ELECTRICAL_CABLE A <NON_EMPTY_SET> of insulated <WIRE>s formed into one continuous strand for the purpose of transmitting electrical power or signals; an electrical cable.   365
ELECTRICAL_FIELD A <REGION> where a field of force produced by a electrically charged <OBJECT> or by a changing <MAGNETIC_FIELD> is found; an electrical field [SOED, "electric field"].   366
ELECTRICAL_SIGNAL_LINE A <SYSTEM> of <WIRE>s and their supports above the <TERRAIN> that transmit electrical signals over distance; an electrical signal line.
EXAMPLES     Telegraph line, telephone line.
  367
ELECTRICAL_SIGNAL_LINE_PYLON A <PYLON> and/or <POLE> used to support an <ELECTRICAL_SIGNAL_LINE>.   368
ELECTRIFIED_RAILWAY_PYLON A <PYLON> and/or <POLE> used to support a <POWER_TRANSMISSION_LINE> associated with an electrified <RAILWAY>.   369
ELECTROMAGNETIC_MATERIAL-
_PROPERTY_SET
A <PROPERTY_SET> describing the electromagnetic properties of the <MATERIAL>s composing an <OBJECT>.   370
ELECTROMAGNETIC_PULSE A broadband, high-intensity, short duration burst of electromagnetic radiation; an electromagnetic pulse. The resulting <ELECTRICAL_FIELD>s and <MAGNETIC_FIELD>s may couple with electrical and/or electronic <SYSTEM>s to produce damaging current and voltage surges.   371
ELECTROMAGNETIC_REFRACTIVE-
_EVAPORATIVE_DUCT
A layer of the <ATMOSPHERE> that is over a <WATERBODY> and in which electromagnetic waves launched in certain <DIRECTION>s are guided by and/or trapped within the layer rather than propagating radially from their source, caused by a decrease in <<WATER_VAPOUR_PRESSURE>> with <<HEIGHT_AGL>> due to evaporation; electromagnetic refractive evaporative duct.   372
ELEVATED_ELECTRICAL_CABLE An <ELECTRICAL_CABLE> located above a <PLANETARY_SURFACE>; elevated electrical cable.   373
ELEVATION_CONTOUR_LINE An <ISOPLETH> of constant <<ELEVATION>>; an elevation contour line.   374
EM_PULSE_COMPTON_EFFECT The <ELECTROMAGNETIC_PULSE> caused by the Compton effect following a nuclear explosion.   375
EMBANKMENT A long, raised mound of <SOIL>, <ROCK>, and/or other <MATERIAL>s in the <TERRAIN>, which is often used to support a <LAND_TRANSPORTATION_ROUTE>; an embankment.   376
EMBASSY A <BUILDING> housing the office of an ambassador and/or the ambassador's staff; embassy.   377
EMBASSY_COMPOUND An enclosed <SITE> containing an <EMBASSY>; an embassy compound.   378
ENGINE_TEST_CELL A <STRUCTURE> where engines are tested; an engine test cell.   379
ENGINEER_BRIDGE A temporary <BRIDGE> spanning and providing passage over a <TERRAIN_OBSTACLE> (for example: a <WATERBODY> and/or a <GULLY>); an engineer bridge.   380
ENGINEER_DITCH A <TRENCH> that is constructed to bury <PIPELINE>s, <ELECTRICAL_SIGNAL_LINE>s, or <POWER_TRANSMISSION_LINE>s; an engineer ditch.   381
ENGINEER_TRENCH An engineered <TRENCH> or combination <TRENCH> and <PARAPET>, usually placed to turn, slow, or stop the movement of <MOTOR_VEHICLE>s; an engineer trench.   382
EQUIPMENT <OBJECT>s used and/or required for a particular purpose; equipment [SOED, "equipment", 1].   383
EQUIPMENT_COMPONENT A <COMPONENT> of an item of <EQUIPMENT>.   384
ESCALATOR <EQUIPMENT> consisting of a moving <STAIR> made on the endless-chain principle, so that the steps ascend or descend continuously, for carrying <HUMAN>s up or down; an escalator.   385
ESCARPMENT A steep, vertical, or overhanging face of <ROCK> and/or <SOIL> in the <LAND>; an escarpment.   386
ESKER A long, narrow <RIDGE> of <SAND> and gravel deposited by a glacial <RIVER>; an esker.   387
ESTUARY An arm of a <WATERBODY> that extends inland to meet the mouth of a <RIVER> and includes a mixture of fresh and salt <WATER>; an estuary [AHD, "estuary", 2].   388
EXCAVATING_MACHINE <EQUIPMENT> for removing <MATERIAL>s (for example: <SOIL>) from the <TERRAIN>; an excavating machine.   389
EXCAVATION An excavated space in the <TERRAIN>; excavation [SOED, "excavation", 2].   390
EXHIBITION_GROUND A <TRACT> where permanent <STRUCTURE>s exist to hold outdoor exhibitions; an exhibition ground.   391
EXPLOSIVE_CHARGE An explosive <DEVICE> that may be detonated to either damage or destroy <STRUCTURE>s or to move <ROCK>, <SOIL>, and/or other <MATERIAL>s; an explosive charge.   392
EXPLOSIVE_LAND_MINE An <EXPLOSIVE_MINE> used in land warfare.   393
EXPLOSIVE_MINE An explosive <DEVICE> located on or below a <PLANETARY_SURFACE>, usually emplaced for military purposes; an explosive mine [SOED, "land-mine", a].   394
EXPLOSIVE_NAVAL_MINE An <EXPLOSIVE_MINE> used in naval warfare.   395
EXPOSED_BEDROCK A <TERRAIN_SURFACE_REGION> consisting principally of <BEDROCK> that is covered by less than 10 percent loose <MATERIAL> (for example: <SOIL>, <SAND>, clay, and/or gravel); exposed bedrock.   396
EXTERIOR_HALLWAY A <HALLWAY> along the exterior of a <BUILDING>, often appearing as a long <BALCONY>.   397
EXTERIOR_WALL A <WALL> forming an exterior section of a <STRUCTURE>.   398
EXTRACTION_FACILITY A <FACILITY> for extracting and/or exploiting natural resources; an extraction facility.   399
EXTRACTION_MINE An <EXCAVATION> made in the <TERRAIN> for the purpose of extracting and/or exploiting natural resources; an extraction mine.   400