【文档说明】unit 4 Natural Disasters -2020-2021学年高一英语同步拓展阅读 （人教版2019必修第一册）.docx，共(2)页，29.168 KB，由管理员店铺上传

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ElephantsonthecoastofThailandareactingstrangely.Theystamptheirfeetandsignal(示意)towardthehills.Theseadrawsbackfromthebeaches

.Fishfallheavilyinthemud(淤泥).Suddenly,ahugewaveappears.Thisisnoordinarywave.Itisatsunami!Tsunamiwavesarelargerandfasterthannormalsurfacewave

s.Atsunamiwavecantravelasfastasajetplaneandcanbeastallasaten-storybuilding.Imaginedroppingastoneintoapool.Thewateronthesurfaceripples(起

涟漪).Atsunamiislikeaverypowerfulripple.Tsunamisbeginwhentheoceanrisesorfallsverysuddenly.Lotsofseawaterisdisplaced.Thismovement

causeshugewaves.Ifatsunamihappens,theremustbesomekindofforcethatcausestheoceanwatertobecomedisplaced.Mosttsunamisarecausedbyunderwaterearthquakes.

However,volcanoes,landslides,largeicebergs,andevenmeteorites(陨石)areabletocauseoneofthesehugewaves.Tsunamisareextremelypowerful.Ordinary

waveslosepowerwhentheybreak.Tsunamiwavescanremainpowerfulforseveraldays.Becausetsunamiwavesaresostrong,theycankillpeople,damagebuildings,andcomple

telyruinanecosysteminjustonehour.Scientistshavenowayofpredicting(预测)whenatsunamiwillhit.However,ifapowerfulenoughearthquakehappens,scientistsca

nsendoutawarningorawatch.Awarningmeansthatatsunamiwillverylikelyhitsoon.Awatchmeansthatconditionsarefavorable(有利的)foratsunami.Whenpeoplearetoldtokeep

watchonatsunamiorgivenawarning,theyhavemoretimetoprepare.Itisbestnottogetcaughtunaware(没意识到)whenatsunamiisontheway!获得更多资源请扫码加入享学资源网微信公众

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