The most obvious feature is a volcano, but the surface could also be fractured or faulted (a fault is a fracture where the rocks have moved on either side, causing earthquakes).
(the rocks; causing; earthquakes) (the surface; could also be fractured; ) (the surface; faulted; ) (a fault; is; a fracture where the rocks have moved on either side,) Context(a fault is,List([91, 101))):(The most obvious feature; is; a volcano) (the rocks; have moved; on either side; L:a fracture)
a fault is,List([91, 101))
the rocks the surface the surface a fault The most obvious feature the rocks
causing could also be fractured faulted is is have moved
earthquakes
a fracture where the rocks have moved on either side,
a volcano
on either side L:a fracture