( ( ( The portion ) ( one ( can ( sense ( at ( ( Earth 's ) surface ) ) ) ) ) ) ( ( ( comes only ) ( from ( ( the ( uppermost layer ) ) ( of ( the ( outer core ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN portion)) (SBAR (S (NP (PRP one)) (VP (MD can) (VP (VB sense) (PP (IN at) (NP (NP (NNP Earth) (POS 's)) (NN surface)))))))) (VP (VBZ comes) (ADVP (RB only)) (PP (IN from) (NP (NP (DT the) (JJ uppermost) (NN layer)) (PP (IN of) (NP (DT the) (JJ outer) (NN core)))))) (. .)))
The portion one can sense at Earth's surface comes only from the uppermost layer of the outer core.
(ROOT (S (NP (NP (DT The) (JJ outer) (NN core)) (PP (IN of) (NP (DT the) (NN earth)))) (VP (VBZ is) (ADJP (JJ molten))) (. .)))