( ( The Earth ) ( ( ( rotates once ) ( ( ( every ( 24 hours ) ) , ) ( which ( produces ( ( day and ) night ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN Earth)) (VP (VBZ rotates) (ADVP (RB once)) (NP (NP (DT every) (CD 24) (NNS hours)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ produces) (NP (NN day) (CC and) (NN night))))))) (. .)))
The Earth rotates once every 24 hours, which produces day and night.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (QP (JJR fewer) (IN than) (CD 24)) (NNS hours)) (PP (IN of) (NP (NP (NN daylight)) (PP (IN in) (NP (NN alaska)))))) (PP (IN during) (NP (NP (DT each) (NN day)) (PP (IN in) (NP (NNP april))))) (SBAR (IN because) (S (NP (NP (NN earth) (POS 's)) (NN rotation)) (VP (VBZ causes) (NP (DT both) (NN day) (CC and) (NN night)))))) (. .)))