( ( ( ( ( Surface tension ) ( allows ( liquids ( to ( form ( round drops ) ) ) ) ) ) and ) ( insects ( ( called ( water striders ) ) ( to ( walk ( across ( ( the ( taut surfaces ) ) ( of ponds ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (JJ Surface) (NN tension)) (VP (VBZ allows) (S (NP (NNS liquids)) (VP (TO to) (VP (VB form) (NP (NN round) (NNS drops))))))) (CC and) (S (NP (NNS insects)) (VP (VBD called) (NP (NN water) (NNS striders)) (S (VP (TO to) (VP (VB walk) (PP (IN across) (NP (NP (DT the) (ADJP (JJ taut)) (NNS surfaces)) (PP (IN of) (NP (NNS ponds)))))))))) (. .)))
Surface tension allows liquids to form round drops and insects called water striders to walk across the taut surfaces of ponds.
(ROOT (S (NP (JJ Surface) (NN tension)) (VP (VBZ is) (ADJP (JJ responsible) (PP (IN for) (NP (DT the) (NN fact)))) (SBAR (IN that) (S (NP (JJ small) (NNS insects)) (VP (MD can) (VP (VB walk) (PP (IN on) (NP (NN water)))))))) (. .)))