(通用版)2018_2019高中地理第一章海洋概述1.1地球上的海与洋课件新人教版选修2.ppt

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1、第一节 地球上的海与洋,1.结合经纬网图,认识海洋分布大势,了解海与洋的区别及各自的特点。 2.结合地图掌握四大洋的基本概况。 3.理解海、海峡、海湾的区别以及海、海峡交通位置的重要性。,知识点一,知识点二,四大洋的特点及分界线 1.四大洋的特点,知识点一,知识点二,知识点一,知识点二,知识点一,知识点二,知识点一,知识点二,2.四大洋的分界线,知识点一,知识点二,海的类型 海按照其所处的位置,分为边缘海、内陆海和陆间海,如下表所示。,方法技巧海与海湾的区别 (1)海是指与大洋相连接的大面积区域,即大洋的边缘部分。 (2)海或洋伸进陆地的部分叫海湾。海湾是海或洋的一部分,其深度和宽度一般向大陆

2、方向逐渐减小,是海或洋靠近岸边,且有两面或三面靠岸的水面。,【例题1】 有关四大洋的说法,正确的是( ) A.太平洋东部海岸线曲折,西部海岸线平直陡峭 B.印度洋南部因被较多的半岛和岛屿穿插分割,海岸线曲折 C.北大西洋海岸线曲折,南大西洋海岸线平直 D.北冰洋在四大洋中面积最小,海岸线平直 答案:C 解析:太平洋西部海岸线曲折,东部海岸线平直陡峭;印度洋南部海岸线平直;北冰洋海岸线曲折,岛屿众多。,【例题2】 海和海湾是两个既有区别又有联系的概念。结合所学知识完成下列各题。 (1)下列水域属于海湾的是( ) A.里海 B.死海 C.阿拉伯海 D.北冰洋 (2)下列海域属于陆间海的是( ) A.北海 B.地中海 C.波罗的海 D.东海 答案:(1)C (2)B 解析:第(1)题,里海和死海不是海,而是内陆湖;阿拉伯海是印度洋向大陆的延伸且深度不断变浅,符合海湾的概念;北冰洋是大洋。第(2)题,波罗的海是内陆海,北海和东海是边缘海,而地中海位于亚欧大陆和非洲大陆之间,属于陆间海。,

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