waves and tides - mr. boettcher's class · what is a wave • there are different types of...
TRANSCRIPT
What is a Wave • Therearedifferenttypesofwaves,butthemovementforallofthemisfairlysimilar(Theyhavetroughsorcrests)
• WaterWavesarechangesinpa/ernsthatmovealongthewater’ssurface• Althoughthewavewilltravelveryfardistances(100’sofkmiftalkingaboutanocean)thewateritselfdoesnotmoveveryfar
Causes of Waves • Mostwavesarecausedbythewind• Thestrongerthewindthebiggerthewave
• Inlargerdeepwaterwavesthemo$onwillseemupanddown• Asthewavegetstoshallowerwater,theboIomdragsslowingitdown,andthetopsofthewaveareabletobreakcrashingontotheshore
Effects of Waves on Shorelines • TheforceofwavescrashingagainstashorelinecanchangetheshapeoftheshorewhetheritshardrockorsoKsand• Largewaveserodeawaytheshore• Smallwavesmovegentlyontotheshore,anddepositsandorothermaterialsneartheshore
Tsunamis (Harbor Wave) • ArecreatedbyEarthquakes(seismicwaves),orundergroundvolcanoerupGons• Theresultishugeoceanwaves(TidalWaves),thatarelargeandspreadoutoverlongdistances• Notveryno$ceableinopenocean• Inshallowerwatercanriseashighasa15storybuilding
Theenergyoriginatesen$relyinthewater,meaningtheforceistravelingthroughthewater
Tides • Tidereferstothedailychangeintheoceanswaterlevel• Twotypes
• HighTide:waterlevelatitshighest• LowTide:waterlevelatitslowest
• TidesoccurduetogravityTwiceaday(12hoursand50minutes)• ThemoonsgravitypullingontheearthcreatehighGde• Thelackofgravitypullingontheoppositesideoftheglobe(waterbulges)
• Highandlow$dearealwaysoccurringatdifferent$meseachday,sopeopleuse$detablestoknowwhenthe$deswilloccur