( ( ( trace gas ) ( ( see ( atmosphere venus ) ) ( what ( normal ( volcanic activity ) ) ) ) ) . )
(ROOT (S (VP (VB trace) (NP (NN gas)) (VP (VB see) (NP (NN atmosphere) (NNS venus)) (FRAG (X (WP what)) (NP (JJ normal) (JJ volcanic) (NN activity))))) (. .)))
trace gas see atmosphere venus what normal volcanic activity.
(ROOT (S (NP (JJ Volcanic) (NNS gases)) (VP (VBP helpe) (S (VP (TO to) (VP (VB form) (NP (DT the) (NN atmosphere)) (PP (IN on) (NP (NN earth))))))) (. .)))