02:45Earth: The Power of the PlanetOceansBBC Two Duration: 59 minutes Audio described Thu 13th Dec 2007, 02:45 on BBC One East MidlandsAvailable for yearsWatch nowGeography series with Dr Iain Stewart. Iain travels to surfers' paradise Hawaii to learn more about oceans, explaining the difference between waves, tides and currents.ContributorsPresenter:Iain StewartGenresFactualScience & NatureFormatsDocumentariesSeriesEarth: The Power of the Planet Source: BBC Online