( ( In addition ) ( , ( Iceland ( ( ( ( ( sits ( on ( the ( Mid-Atlantic Ridge ) ) ) ) , ) and ) ( is ( ( a ( good example ) ) ( of ( sea-floor ( spreading ( and ( plate tectonics ) ) ) ) ) ) ) ) ; ) ) ) )
(ROOT (S (PP (IN In) (NP (NN addition))) (, ,) (NP (NNP Iceland)) (VP (VP (VBZ sits) (PP (IN on) (NP (DT the) (NNP Mid-Atlantic) (NNP Ridge)))) (, ,) (CC and) (VP (VBZ is) (NP (NP (DT a) (JJ good) (NN example)) (PP (IN of) (NP (JJ sea-floor) (NN spreading) (CC and) (NN plate) (NNS tectonics)))))) (: ;)))
In addition, Iceland sits on the Mid-Atlantic Ridge, and is a good example of sea-floor spreading and plate tectonics;
(ROOT (S (NP (NNP Iceland)) (VP (VBZ sits) (PP (IN on) (NP (DT the) (JJ mid-atlantic) (NN ridge)))) (. .)))