( Drought ( ( is ( ( a ( continuous period ) ) ( of ( ( dry weather ) ( due ( to ( lack ( of rain ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Drought)) (VP (VBZ is) (NP (NP (DT a) (JJ continuous) (NN period)) (PP (IN of) (NP (NP (JJ dry) (NN weather)) (ADJP (JJ due) (PP (TO to) (NP (NP (NN lack)) (PP (IN of) (NP (NN rain)))))))))) (. .)))
Drought is a continuous period of dry weather due to lack of rain.
(ROOT (S (NP (NNS Droughts)) (VP (VBZ occurs) (SBAR (WHADVP (WRB when)) (S (NP (EX there)) (VP (VBZ is) (ADJP (JJ little) (PP (TO to) (NP (NP (DT no) (NN rain)) (PP (IN in) (NP (NP (DT a) (NN period)) (PP (IN of) (NP (NN time)))))))))))) (. .)))