( ( The ( axial shift ) ) ( ( was ( ( caused ( by ( ( the redistribution ) ( of mass ) ) ) ) ( on ( ( ( ( the ( Earth 's ) ) surface ) , ) ( which ( changed ( ( ( the ( planet 's ) ) moment ) ( of inertia ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ axial) (NN shift)) (VP (VBD was) (VP (VBN caused) (PP (IN by) (NP (NP (DT the) (NN redistribution)) (PP (IN of) (NP (NN mass))))) (PP (IN on) (NP (NP (NP (DT the) (NN Earth) (POS 's)) (NN surface)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBD changed) (NP (NP (NP (DT the) (NN planet) (POS 's)) (NN moment)) (PP (IN of) (NP (NN inertia))))))))))) (. .)))
The axial shift was caused by the redistribution of mass on the Earth's surface, which changed the planet's moment of inertia.
(ROOT (S (NP (NP (DT The) (NN movement)) (PP (IN of) (NP (NP (DT an) (NN air) (NN mass)) (PP (IN over) (NP (NP (NN earth) (POS 's)) (NN surface)))))) (VP (VBZ causes) (NP (JJ local) (NN weather) (NNS changes))) (. .)))