( ( ( The angle ) ( of tilt ) ) ( ( is ( called rake ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN angle)) (PP (IN of) (NP (NN tilt)))) (VP (VBZ is) (VP (VBN called) (NP (NN rake)))) (. .)))
The angle of tilt is called rake.
(ROOT (S (NP (NP (NNP Instruments)) (SBAR (WHNP (WDT that)) (S (VP (VB measure) (NP (NP (DT the) (NN angle)) (PP (IN of) (NP (NP (DT the) (NN slope)) (PP (IN of) (NP (DT a) (NN volcano)))))))))) (VP (VBP are) (VP (VBN called) (NP (NN tilt) (NNS meters)))) (. .)))