 Hydrothermal vents form in volcanically active areas, such as mid-ocean ridges where two plates are diverging, separating from each other, resulting in the formation of new crust.At such sites, water penetrates through the hot crust, causing the pressure and temperature to change, resulting in precipitation of minerals, eventually creating hydrothermal chimneys.After the hydrothermal fluids temperature decreases and mixes with the seawater, the environment will reach ideal thermal and chemical conditions that supports a unique biological community.