( ( Describe ( ( the causes ) ( of ( ( day and ) night ) ) ) ) . )
(ROOT (S (VP (VB Describe) (NP (NP (DT the) (NNS causes)) (PP (IN of) (NP (NN day) (CC and) (NN night))))) (. .)))
Describe the causes of 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)))))) (. .)))