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Oceans and Seas

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Oceans and Seas (21:00)

Item# 34724
©2006

More than 70 percent of the Earth’s surface is covered by water. Use this video to impress upon your students the importance of the seven seas to people, the marine food chain, and the planet as a whole. Topics include the various kinds of currents and the forces that influence them, tides and waves (what they are, what causes them, and how they’re classified), features of the seabed, and the formation and shaping of coastlines. A basic explanation of how oceans have been affected by human activity is also provided. A viewable/printable instructor’s guide is available online. Correlates to National Science Education Standards, National Educational Technology Standards, and Standards for the English Language Arts. A Cambridge Educational Production. (21 minutes)

Segments in this Video - (6)

1. Water: Vitality, Origins, Regions, and Water Cycle (03:24)

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Modern Biologists believe that water is an essential element to life on earth. Theoretically, the earth's water originated from volcanic eruptions as the earth was cooling. Four major ocean regions include Atlantic, Indian, Arctic, and Pacific.

2. Geology of the Ocean Floor (04:52)

Continental margins, where the continental crust meets the ocean floor, are divided into the continental shelf, continental slope, and continental rise. Beyond the continental margins are the abyssal plains and the mid-ocean ridge systems.

3. Waves (03:30)

Wind blowing across the surface of the water creates waves, progressions of energy from one point to another. Underwater earthquakes can cause tsunamis, or giant waves.

4. Tides and Tidal Patterns (01:31)

Tides, the periodic vertical rise and fall of water, result from the gravitational pull of the moon and sun on the oceans. Spring tides and neap tides occur twice a month coordinating with the moon's cycle. Tidal patterns happen on a daily basis.

5. Currents: Gyres, Deep Ocean Currents, Surface Flows, El Niño, La Niña (03:43)

Ocean currents are driven by the motions of the earth's atmosphere involving factors such as temperature, salinity, and wind. Deep ocean currents affect 80 to 90 percent of ocean waters and travel at slower speeds than surface flows.

6. Ocean and Global Climate (01:51)

The oceans have been greatly affected by human activities such as pollution, over-fishing, and increased carbon-dioxide emissions. As the earth gets warmer, polar ice melts, changing the temperature and level of the ocean.