( ( This atmosphere ) ( ( was ( ( formed ( by ( ( the ( constant outpouring ) ) ( of ( gases ( from ( ( the ( Earth 's ) ) interior ) ) ) ) ) ) ) ( through ( ( ( volcanic eruptions ) , ) ( known ( as outgassing ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This) (NN atmosphere)) (VP (VBD was) (VP (VBN formed) (PP (IN by) (NP (NP (DT the) (JJ constant) (NN outpouring)) (PP (IN of) (NP (NP (NNS gases)) (PP (IN from) (NP (NP (DT the) (NN Earth) (POS 's)) (NN interior))))))) (PP (IN through) (NP (NP (JJ volcanic) (NNS eruptions)) (, ,) (VP (VBN known) (PP (IN as) (NP (NN outgassing)))))))) (. .)))
This atmosphere was formed by the constant outpouring of gases from the Earth's interior through volcanic eruptions, known as outgassing.
(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))))))) (. .)))