商务星球版七上地理第一单元《地球》复习教案.doc

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1、商务星球版七上地理第一单元地球复习教案商务星球版七上地理第一单元地球复习教案第一单元地球复习教案【教学目标】1、了解地球的形状和大小。2、了解经纬线的特点和经纬度的划分，掌握半球的划分。3、了解自转的特点和产生的现象。4、了解公转的特点和产生的现象。【教学重点】自转和公转的特点和现象【教学用具】教学挂图和投影片【教学过程】1、地球的形状和大小。 地球的形状：两极稍扁，赤道略鼓，不规则的球体。 地球的大小：半径、周长，体积。 （补充）了解人们对于地球形状的认识过程，特别注意生活中能够证明地球是一个球体的现象和麦哲伦环球航行的意义。2、在地球上认识经纬网。 列表：经纬线的特点经线纬线定义连接南北两

2、极并且与纬线垂直相交的半圆与地轴垂直并且环绕地球一周的圆圈形状半圆圆长度一样长赤道最长，南北极最短指示方向南北方向东西方向特殊线0度经线赤道、南北回归线、极圈分布规律0度经线以东为东经，数值越来越大，0度经线以西为西经，数值越来越大并在180度东西经重合。赤道纬度是0度，以北为北纬，以南为南纬，数值逐渐增大，到南北极点为90度半球划分西经20度和东经160度是东西半球的分界线赤道是南北半球的分界线(强调)这是本章一个重点内容，要通过大量的练习掌握经纬度的确定和半球的划分，能够在经纬网上确定一点的经纬度和所在的半球。3、地球的自转和公转列表比较自转和公转的特点和现象。项目自转公转方向自西向东（北

3、逆南顺）自西向东周期一天一年现象昼夜更替，东早西晚昼夜长短变化，四季变化（强调）这是本章的另外一个重点内容，要熟练掌握自转的公转的特点和产生的现象，能够看懂公转示意图，找出每个位置地球的节气和昼夜情况。 总结：本章是一个重点单元，内容重要，难度大，需要认真学习，反复练习，才能适应考察的要求。【作业设计】经纬度的划分，自转和公转的现象结束语！祝大家学到有用的知识，提升自己的能力，实现自己的梦想，踏踏实实干好每一件事，为美好的明天而努力！16chgjcq3bbqz30mf2g,ihtiy7484.ha15udr57rro4n,m,6ehgz1hhk0,fewsxz1rr16l,1ldbg7wwk3

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