refracted waverefractionrefraction anglerefraction profilerefractometerrefractoryrefractory clay or fireclay or fireclayrefringence or refractivity or refractivityrefugerefugianrefugiumregregelation layerregenerated glacierregenerated rockregenerated soilregimeregime channelregime theory or regime or regimeregimenregimen streamregionregionalregional dataregional dipregional geologyregional gravity mapregional metamorphismregional metasomatism or metasomatism or metasomatismregional overstepregional research laboratory or rrl or rrlregional unconformity or unconformity or unconformityregister markregister punchregistrationregmagenesis or rhegmagenesis or rhegmagenesis or regmaticregmaglypt or piezoglypt or piezoglypt or pezographregmiteregolith or mantle rock or mantle rock or rhegolithregosolregrading streamregressionregression coefficientregression conglomerateregression curveregression equationregressive erosionregressive overlap or offlap or offlapregressive reefregressive ripple
