( ( ( Electrical conduction ) ( of metals ) ) ( ( ( ( is ( a ( well-known phenomenon ) ) ) and ) ( is ( attributed ( to ( ( ( the ( free ( conduction electrons ) ) ) , ) ( which ( can ( be ( ( measured ( as sketched ) ) ( in ( the figure ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ Electrical) (NN conduction)) (PP (IN of) (NP (NNS metals)))) (VP (VP (VBZ is) (NP (DT a) (JJ well-known) (NN phenomenon))) (CC and) (VP (VBZ is) (VP (VBN attributed) (PP (TO to) (NP (NP (DT the) (JJ free) (NN conduction) (NNS electrons)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (MD can) (VP (VB be) (VP (VBN measured) (ADJP (RB as) (JJ sketched)) (PP (IN in) (NP (DT the) (NN figure))))))))))))) (. .)))
Electrical conduction of metals is a well-known phenomenon and is attributed to the free conduction electrons, which can be measured as sketched in the figure.
(ROOT (S (NP (NNP Metal)) (VP (VBZ conducts) (NP (NP (NN heat) (CC and) (NN electricity)) (ADVP (RB so)) (PP (RB well) (RB because) (IN of) (NP (JJ free) (VBG flowing) (NNS electrons))))) (. .)))