( ( Explain ( that ( ( ( ( as ( ( ( water molecules ) ( in ( ( the air ) ( ( cool and ) slow ) ) ) ) down ) ) ( , ( ( their attractions ) ( overcome ( their speed ) ) ) ) ) and ) ( they ( ( ( join together ) , ) ( forming ( liquid water ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB Explain) (SBAR (IN that) (S (S (SBAR (IN as) (S (NP (NP (NN water) (NNS molecules)) (PP (IN in) (NP (NP (DT the) (NN air)) (ADJP (JJ cool) (CC and) (JJ slow))))) (ADVP (RB down)))) (, ,) (NP (PRP$ their) (NNS attractions)) (VP (VBP overcome) (NP (PRP$ their) (NN speed)))) (CC and) (S (NP (PRP they)) (VP (VBP join) (ADVP (RB together)) (, ,) (S (VP (VBG forming) (NP (JJ liquid) (NN water))))))))) (. .)))
Explain that as water molecules in the air cool and slow down, their attractions overcome their speed and they join together, forming liquid water.
(ROOT (S (PP (IN As) (NP (NP (DT the) (NN temperature)) (PP (IN of) (NP (NN water) (NNS decreases))))) (, ,) (NP (DT the) (NN water) (NNS molecules)) (VP (VB slow) (PRT (RP down))) (. .)))