Southern Ocean
The Southern Ocean comprises the southernmost waters of the World Ocean, generally taken to be south of 60S latitude and encircling Antarctica. As such, it is regarded as the fourth-largest of the five principal oceanic divisions . This ocean zone is where cold, northward flowing waters from the Antarctic mix with warmer subantarctic waters.
Geographers disagree on the Southern Oceans northern boundary or even its existence, with many considering the waters part of the Pacific, Atlantic, and Indian Oceans instead. Others regard the Antarctic Convergence, an ocean zone which fluctuates seasonally, as separating the Southern Ocean from other oceans, rather than the 60th parallel. Australian authorities regard the Southern Ocean as lying immediately south of Australia.
The International Hydrographic Organization has not yet ratified its 2000 definition of the ocean as being south of 60S. Its latest published definition of oceans dates from 1953; this does not include the Southern Ocean. However, the more recent definition is used by the IHO and others.
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2014人教新目标英语八下unit 6《An old man tried to move the mountains》 words单词听力朗读素材（mp3）
2014人教新目标英语八下unit 6《An old man tried to move the mountains》课件2
2014人教新目标英语八年级下册unit 4《Why don’t you talk to your parents》section a 1a-2d课件
2014人教新目标英语八下unit2《I’ll help to clean up the city parks》section a 3a-4c（含grammar focus）课件
2014人教新目标英语八下unit2《I’ll help to clean up the city parks》section b 2b课本听力素材（mp3）
2014人教新目标英语八下unit2《I’ll help to clean up the city parks》section b 2a-2e课件
2014人教新目标英语八下unit2《I’ll help to clean up the city parks》section b 3a-3b（含self check）课件
2014人教新目标英语八下unit 7《What’s the highest mountain in the world》 section a课件
2014人教新目标英语八下unit 9《Have you ever been to a museum》专题复习课件
2014人教新目标英语八下unit 8《Have you ever read treasure island yet》section a 1b课本听力素材（mp3）
2014人教新目标英语八下unit 7《What’s the highest mountain in the world》 section b课件
2014人教新目标英语八下unit 8《Have you ever read treasure island yet》section a 2a课本听力素材（mp3）
2014人教新目标英语八下unit 7《What’s the highest mountain in the world》 period 3课件
2014人教新目标英语八下unit2《I’ll help to clean up the city parks》section a 1a-2d课件
2014人教新目标英语八下unit 7《What’s the highest mountain in the world》section b 1b课本听力素材（mp3）
2014人教新目标英语八下unit2《I’ll help to clean up the city parks》section a 2b课本听力素材（mp3）
2014人教新目标英语八下unit 7《What’s the highest mountain in the world》课件
2014人教新目标英语八下unit2《I’ll help to clean up the city parks》section b 1c课本听力素材（mp3）
2014人教新目标英语八下unit2《I’ll help to clean up the city parks》words单词听力朗读素材（mp3）
2014人教新目标英语八下unit 8《Have you ever read treasure island yet》 section b课件
2014人教新目标英语八下unit 7《What’s the highest mountain in the world》section b 1c课本听力素材（mp3）
2014人教新目标英语八下unit2《I’ll help to clean up the city parks》section a 2a课本听力素材（mp3）
2014人教新目标英语八下unit 7《What’s the highest mountain in the world》section b 2b课本听力素材（mp3）
2014人教新目标英语八下unit 9《Have you ever been to a museum》课件
2014人教新目标英语八下unit 7《What’s the highest mountain in the world》section a 3a课本听力素材（mp3）
2014人教新目标英语八下unit2《I’ll help to clean up the city parks》section b 1d课本听力素材（mp3）
2014人教新目标英语八下unit 6《An old man tried to move the mountains》课件4
2014人教新目标英语八下unit 7《What’s the highest mountain in the world》 period 1课件
2014人教新目标英语八下unit 7《What’s the highest mountain in the world》专题复习课件
2014人教新目标英语八下unit2《I’ll help to clean up the city parks》section b 1a-1e课件