Over twenty years later, we know these hydrothermal vents to occur all along the length of the mid-ocean ridge, a globe-encircling volcanic mountain chain that marks where the Earth's tectonic plates move apart.
(a globe-encircling volcanic mountain chain; marks; ) (the Earth's tectonic plates; move; apart) (we; know; these hydrothermal vents to occur all along the length of the mid-ocean ridge; T:Over twenty years later) Context(we know,List([25, 32))):(these hydrothermal vents; to occur; L:all along the length of the mid-ocean ridge)
we know,List([25, 32))
a globe-encircling volcanic mountain chain the Earth's tectonic plates we these hydrothermal vents
marks move know to occur
apart
these hydrothermal vents to occur all along the length of the mid-ocean ridge T:Over twenty years later
L:all along the length of the mid-ocean ridge