adjective agulhas bank aquatic ecosystem barnacle benthic zone cold seep common periwinkle continental margin continental shelf demersal zone department of natural resources erosion estuary humidity hydrothermal vent intertidal ecology intertidal zone kelp forest klamath river landform lichen limnetic zone littoral combat ship marine biology marine debris microclimate minnesota neritic zone neritidae noun oceanography oyster pelagic zone photic zone photosynthesis predation primary production profundal zone seamount shingle beach strait supralittoral zone united states navy university of salzburg wiktionary