( It ( ( ( is ( highly unlikely ) ) ( that ( ( ( a ( natural source ) ) ( of ( ( heat radiation ) ( -LRB- ( ( ( ( ( a geyser ) or ) ( a concentration ) ) ( of ( ( ( ( radioactive minerals ) ( under ( the surface ) ) ) , ) ( for example ) ) ) ) -RRB- ) ) ) ) ) ( would ( create ( such ( a ( perfect ( geometric pattern ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ is) (ADJP (RB highly) (JJ unlikely)) (SBAR (IN that) (S (NP (NP (DT a) (JJ natural) (NN source)) (PP (IN of) (NP (NP (NN heat) (NN radiation)) (PRN (-LRB- -LRB-) (NP (NP (NP (DT a) (NN geyser)) (CC or) (NP (DT a) (NN concentration))) (PP (IN of) (NP (NP (JJ radioactive) (NNS minerals)) (PP (IN under) (NP (DT the) (NN surface))) (, ,) (PP (IN for) (NP (NN example)))))) (-RRB- -RRB-))))) (VP (MD would) (VP (VB create) (NP (PDT such) (DT a) (JJ perfect) (JJ geometric) (NN pattern))))))) (. .)))
It is highly unlikely that a natural source of heat radiation (a geyser or a concentration of radioactive minerals under the surface, for example) would create such a perfect geometric pattern.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (NN water)) (VP (VP (VBZ is) (VP (VP (VBN heated) (PP (IN by) (NP (NN magma)))) (CC and) (VP (VBZ makes) (NP (PRP$ its) (NN way)) (PP (TO to) (NP (DT the) (NN surface)))))) (CC and) (VP (VBZ creates))))) (NP (DT a) (-LRB- -LRB-) (NN n) (-RRB- -RRB-)) (VP (VBP geyser)) (. .)))