( ( ( Viking missions ) ( that ( landed ( on Mars ) ) ) ) ( confirmed ( that ( ( the soil ) ( there ( ( ( was indeed ) red ) ( from ( ( iron oxides ) ( -LRB- ( commonly ( know ( as rust ) ) ) ) ) ) ) ) ) ) ) )
(ROOT (S (NP (NP (JJ Viking) (NNS missions)) (SBAR (WHNP (WDT that)) (S (VP (VBD landed) (PP (IN on) (NP (NNP Mars))))))) (VP (VBD confirmed) (SBAR (IN that) (S (NP (DT the) (NN soil)) (ADVP (RB there)) (VP (VBD was) (ADVP (RB indeed)) (ADJP (JJ red)) (PP (IN from) (NP (NP (NN iron) (NNS oxides)) (SBAR (S (-LRB- -LRB-) (NP (NNP commonly)) (VP (VBP know) (PP (IN as) (NP (NN rust))))))))))))))
Viking missions that landed on Mars confirmed that the soil there was indeed red from iron oxides (commonly know as rust
(ROOT (S (NP (NP (NNP Iron)) (PP (IN in) (NP (DT the) (NN soil)))) (VP (VBZ causes) (S (NP (NNS mars)) (VP (TO to) (VP (VB look) (ADJP (JJ red)))))) (. .)))