earth flowearth pressure balance shieldearth tide correctionearthquakeearthquake epicenterearthquake focusearthquake magnitudeeconomic limiteffective porosityefficiency curveseffluentelastic deformationelectric igniterelectric shotfiringelectrical double layerelectrical efficiencyelectrical methodselectrical rotary drillelectrical rotary percussion drillelectro flotationelectro kineticelectro refiningelectromagnetic type geophoneelectrostatic separatorelectrowinningelevation correctionelutriationeluviumemission spectrographyen echelon faultsen echelon foldsend breakendogenousendoskarnendoskarn zoneendothermic processenergy factorenergy lossenrichment mineralizationenrichment ratioentryenvelope methodepigeneticepigenetic depositepigenetic dispersionepirogenyepithermalequipotential methodequivalent diameterequivalent orifice