"Thermal vents" are openings found on the ocean floor where hot water and gases, such as methane and sulfide, are released into the water. Full definition
A series of thermal vents along the top edge help keep the tablet cool, while speakers situated on either side pull audio duty. (laptopmag.com)
The second is the existence of very deep thermal vents. (drtimball.com)
Beatty believes that when 570 degree Fahrenheit water from thermal vents hits cold, deep ocean currents, several light - producing processes may occur: sonoluminescence from imploding gas bubbles; chemiluminescence from chemical reactions (analogous to fireflies lighting up); crystalloluminescence from the formation of crystal bonds; and triboluminescence from the breaking of those bonds. (discovermagazine.com)