青藏高原Presented ByHarry Mills / PRESENTATIONPRO海洋Presented ByHarry Mills / PRESENTATIONPRO珠穆朗玛峰Presented ByHarry Mills / PRESENTATIONPRO沙漠Presented ByHarry Mills / PRESENTATIONPRO长江Presented ByHarry Mills / PRESENTATIONPRO平原Presented ByHarry Mills / PRESENTATIONPRO第二章认识地球第一节Presented ByHarry Mills / PRESENTATIONPRO地球的形状认识地球形状的过程:盖天说 浑天说麦哲伦环球航行 现代探测技术Presented ByHarry Mills / PRESENTATIONPRO两极略扁赤道略鼓的不规则球体Presented ByHarry Mills / PRESENTATIONPRO表面积 5.1亿平方千米平均半径 6371千米赤道周长约 4万千米Presented ByHarry Mil