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人教新八下Unit4 拓展阅读补充视频 撒哈拉沙漠 人教新八下Unit4 The Wonders of Nature 拓展阅读补充视频 The Sahara desert 撒哈拉沙漠 撒哈拉沙漠位于非洲大陆,是世界上最大的热带沙漠,覆盖超过11个国家,面积约920万平方公里,占非洲面积的31%。其主要地貌包括沙丘、石漠、砾漠、盐滩和绿洲。沙漠中只有尼罗河和尼日尔河两条永久性河流,但有丰富的地下含水层和少量湖泊。夏季气温可超50°C,冬季平均约13°C,中部年降水量不足1英寸,其他地区可达4英寸。然而,在1.15万至5000年前的“非洲湿润期”,整个撒哈拉曾是一片海洋,古老岩画也印证了那时更绿更湿的环境。 The Sahara Desert in Africa is the world’s largest hot desert, spanning over 11 countries and covering about 9.2 million square kilometers. Its main landforms include dunes, hamada, regs, ergs, salt flats, and oases. Only two permanent rivers flow through it, but it has substantial aquifers and a few lakes. Summer temperatures can exceed 50°C, while winter averages around 13°C. The central Sahara receives less than 1 inch of rain per year, though other parts get up to 4 inches. However, between 11,500 and 5,000 years ago, the entire region was a sea, and ancient rock art confirms a greener, wetter past. 字幕制作by teacherwu #初中英语备课 #新八下英语 #新八下英语课件 #新八下unit4 #八下unit4
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