fluviokarst or karst or karst or fluvio karstfluviomarinefluxflux oreflux stonefluxgate magnctometerfluxoturbidityfly ashfly askfly offflyballsflyerflying avalancheflying formflying magnetometerflying scaffoldflying shoreflying shoringflying veins or flying vein or flying veinflysch or macigno or macignoflywheelfm or fermium or fermiumfoam concretefoam markfoamed concretefoaming agentfoaming earthfocal depthfocal distancefocal lengthfocal mechanismfocal mecharismfocal planefocal point or principal focus or principal focusfocal spherefocusfocused current logfodichnia or fugichnia or fugichniafoehn or fohn or fohnfogfog desertfoggara or qanat or qanatfoggitefoid bearingfoid diorite or diorite or dioritefoid monzodiorite or essexite or essexitefoid monzogabbro or monzogabbro or monzogabbrofoid syenitefoiditefoitite
