The OCEAN! (tides)

What are TIDES and what causes the ocean to have them? If we look at this next link we can get a good idea of what tides are and what causes them http://scijinks.jpl.nasa.gov//tides HERE'S A VIDEO ABOUT TIDES http://studyjams.scholastic.com/studyjams/jams/science/weather-and-climate/tides.htm Then we will learn about tidal turbines that generate energy from the oceans tides http://climate.nasa.gov/kids/news/index.cfm?FuseAction=ShowNews&NewsID=11   HERE IS A VIDEO ABOUT  CURRENTShttp://studyjams.scholastic.com/studyjams/jams/science/weather-and-climate/waves-and-currents.htm