( ( Evidence ( from oceans ) ) ( ( comes ( from ( ( cores ( -LRB- ( ( cylindrical samples ) -RRB- ) ) ) ( ( ( drilled out ) ( of sediment ) ) ( in ( the ( ocean floor ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NN Evidence)) (PP (IN from) (NP (NNS oceans)))) (VP (VBZ comes) (PP (IN from) (NP (NP (NNS cores)) (PRN (-LRB- -LRB-) (NP (JJ cylindrical) (NNS samples)) (-RRB- -RRB-)) (VP (VBN drilled) (PRT (RP out)) (PP (IN of) (NP (NN sediment))) (PP (IN in) (NP (DT the) (NN ocean) (NN floor))))))) (. .)))
Evidence from oceans comes from cores (cylindrical samples) drilled out of sediment in the ocean floor.
(ROOT (S (NP (NP (NNS Rocks)) (PP (IN on) (NP (NN ocean) (NN floor)))) (VP (VBZ is) (NP (NN evidence)) (SBAR (IN that) (S (NP (JJ magnetic) (NNS reversals)) (VP (VBP occur))))) (. .)))