Hydrothermal refers to a process or system involving high-temperature water. It can also refer to geothermal systems that involve hot springs, fumaroles and other phenomena resulting from the movement of water through Earth's crust.
In spring 2015, MBARI researchers discovered a large, previously unknown field of hydrothermal vents in the Gulf of California, about 150 kilometers (100 miles) east of La Paz, Mexico. (sciencedaily.com)
«New kind of hydrothermal vent system found in Caribbean.» (sciencedaily.com)
The paper from researchers with the Cassini mission, published in the journal Science, indicates hydrogen gas, which could potentially provide a chemical energy source for life, is pouring into the subsurface ocean of Enceladus from hydrothermal activity on the seafloor. (sciencedaily.com)