( ( ( ( Tides ( Lunar ( Eclipses Activities ) ) ) , ) ( ( Web ( Links ( LUNAR ECLIPSE ) ) ) ( A ( lunar eclipse ) ) ) ) ( ( occurs ( when ( ( ( the ( Earth 's ) ) shadow ) ( falls ( on ( the moon ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Tides) (NNP Lunar) (NNP Eclipses) (NNPS Activities)) (, ,) (NP (NP (NNP Web) (NNP Links) (NNP LUNAR) (NNP ECLIPSE)) (NP (DT A) (NN lunar) (NN eclipse)))) (VP (VBZ occurs) (SBAR (WHADVP (WRB when)) (S (NP (NP (DT the) (NN Earth) (POS 's)) (NN shadow)) (VP (VBZ falls) (PP (IN on) (NP (DT the) (NN moon))))))) (. .)))
Tides Lunar Eclipses Activities, Web Links LUNAR ECLIPSE A lunar eclipse occurs when the Earth's shadow falls on the moon.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (NP (NN earth) (POS 's)) (NN shadow)) (VP (VBZ falls) (PP (IN on) (NP (DT the) (NN moon)))))) (, ,) (NP (DT the) (NN shadow)) (VP (VBZ causes) (NP (DT a) (NN lunar) (NN eclipse))) (. .)))
When earth’s shadow falls on the moon, the shadow causes a lunar eclipse.