( ( ( ( ( As ( they ( ( collide and ) ( enter ( ( the ( Earth 's ) ) atmosphere ) ) ) ) ) ( ( the friction ) ( causes ( them ( to ( burn up ) ) ) ) ) ) and ) ( we ( see ( ( the ( beautiful ( brilliant streaks ) ) ) ( in ( our skies ) ) ) ) ) ) . )
(ROOT (S (S (SBAR (IN As) (S (NP (PRP they)) (VP (VP (VB collide)) (CC and) (VP (VB enter) (NP (NP (DT the) (NN Earth) (POS 's)) (NN atmosphere)))))) (NP (DT the) (NN friction)) (VP (VBZ causes) (S (NP (PRP them)) (VP (TO to) (VP (VB burn) (PRT (RP up))))))) (CC and) (S (NP (PRP we)) (VP (VBP see) (NP (NP (DT the) (JJ beautiful) (JJ brilliant) (NNS streaks)) (PP (IN in) (NP (PRP$ our) (NNS skies)))))) (. .)))
As they collide and enter the Earth's atmosphere the friction causes them to burn up and we see the beautiful brilliant streaks in our skies.
(ROOT (S (NP (NN Friction) (NN force)) (VP (VBZ is) (VP (VBN caused) (PP (IN by) (NP (NP (JJ microscopic) (NNS bumps)) (, ,) (VP (VBZ lumps)) (, ,) (CC and) (NP (NP (NNS imperfections)) (VP (VBG colliding))))))) (. .)))