( ( Explain ( how ( ( air pressure ) ( is ( influenced ( by ( ( density and ) temperature ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB Explain) (SBAR (WHADVP (WRB how)) (S (NP (NN air) (NN pressure)) (VP (VBZ is) (VP (VBN influenced) (PP (IN by) (NP (NN density) (CC and) (NN temperature)))))))) (. .)))
Explain how air pressure is influenced by density and temperature.
(ROOT (S (NP (NNP Depth) (CC and) (NNP density)) (VP (VBP influence) (NP (NP (DT the) (NN pressure)) (PP (IN of) (NP (NNS fluids))))) (. .)))