( ( ( Factors ( Affecting ( Root Depth ) ) ) -- ) Beginnings )
(ROOT (NP (NP (NNP Factors) (NNP Affecting) (NNP Root) (NNP Depth)) (: --) (NP (NNP Beginnings))))
Factors Affecting Root Depth -- Beginnings
(ROOT (S (NP (NNP Depth) (CC and) (NNP density)) (VP (VBP are) (NP (NP (DT the) (CD two) (NNS factors)) (SBAR (WHNP (WDT that)) (S (VP (VBP affect) (NP (NP (DT the) (NN pressure)) (PP (IN of) (NP (NNS fluids))))))))) (. .)))