{"thcode":3,"term":{"code":527,"name":"hydrothermal vents","parent":1010,"scope":"Cracks along a rift or ridge in the deep ocean floor that spews out water heated to high temperature by the magma under the Earth's crust. [Columbia Electronic Encyc., 1999]"},"uf":[],"bt":[{"code":1010,"name":"seafloor features","parent":816,"scope":null},{"code":816,"name":"physiographic features","parent":1,"scope":null},{"code":1,"name":"Categories","parent":null,"scope":null}],"nt":[],"rt":[]}