Geologic SedimentsHydrothermal VentsOceans and SeasSeawaterOceanographyMarine BiologyPacific OceanEcosystemBiodiversityMethaneSilicatesAtlantic OceanRNA, Ribosomal, 16SArchaeaAntarctic RegionsPhylogenyDNA, ArchaealBacteriaBiomassDNA, RibosomalFresh WaterWater MicrobiologySequence Analysis, DNAGeographyWater Pollutants, ChemicalRiversBiodegradation, EnvironmentalDeltaproteobacteriaSulfur-Reducing BacteriaDNA, BacterialEstuariesLakesGenes, rRNAWater Pollution, ChemicalRhizophoraceaeSoil MicrobiologyAnaerobiosisMolecular Sequence DataWater PollutantsWetlandsUraniumWater PollutionEnvironmental MonitoringBase CompositionGeologySulfatesArctic RegionsEutrophicationBacteria, AnaerobicRNA, BacterialWater Pollutants, RadioactiveGammaproteobacteriaAroclorsSoil PollutantsWater MovementsPolycyclic Hydrocarbons, AromaticOxidation-ReductionBiotaPetroleumGroundwaterBaysSulfidesHumic SubstancesCarbonPaleontology