COVER Photomosaic of a 6-meter-tall submarine hydrothermal deposit. Composed mostly of sulfide minerals, many thousands like it form along the mid-ocean ridge system. Hot, nutrient-rich fluids blend with cold seawater, supporting symbiotic fauna on the surface of the edifice and diverse microbial activity within and beneath it. See Delaney et al. on page 222 and the special section beginning on page. 189. [Mosaic: D. Yoergerk and M. Elend]

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