The living ocean.  [Videorecording]. 

 - Washington, D.C. :  National Geographic Society,  c1988. 
 - 1 videocassette (25 min.) :  sd., col. ;  1/2 in. + teacher's guide. 
 - National Geographic edventures ;  51316. .
<br/><br/> Explores the role of the oceans in the biosphere. Tells how the oceans were formed and how the ocean floor provides evidence of tectonic activity. Shows how the ocean figures in food webs, affects climate and weather, and how man affects the oceans. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Marine biology.<br/>Biosphere.<br/>Ocean.