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第八百零六章 从大陆漂移开始......(1 / 2)

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下午五点.

此时正是一天中气温最高的时候,毕方与骆驼躲在了一处岩壁下乘凉.

"一天当中最适合赶路的时间是上午四点到十一点,然后是下午的四点到七点,连夜赶路也可以,但是我说过,那是动物活动的高峰期,因此危险性比较高,并且漆黑的环境下,也更容易让人负担较大的精神压力."

"并且人总是要休息的,我们不是骆驼,不可能不吃不喝好几天,撒哈拉的晚上很冷,在寒冷环境下,尽可能多睡觉,过度活动使你损失的热量是不会循环再生的."

"不用担心你会在睡梦中长眠不醒,除非已经精疲力竭,否则在被冻僵之前你会被冻醒的."

毕方抿了口水,小臂自然下垂,放在膝盖之上,眯着眼看着阴影外的烈阳,到处都是热浪与沙漠.

倘若是外出旅行,跟着大队伍与骆驼队,自然是无比伟岸的自然风光,开阔视野与身心,可若是孤身一人,心里充斥的恐怕都是绝望吧?

毕方拧上水壶,指着面前的茫茫沙漠:"可以想象吗,现在满是沙丘的撒哈拉以前居然是一片茂密的森林."

[可以想象,我想到了][给点面子,方神不想看到你这个反应][意大利面应该拌四十二号混凝土]

[虽然不敢相信,可我不是笨蛋,当老方说出这句话的同时,我就知道,在离谱这也是真的了(狗头)]

[理智告诉我要接受它]

弹幕总是奇奇怪怪,对此早已习惯的毕方并没有打断自己的叙述.

"在东北信风吹拂下,撒哈拉每年都有数以亿吨计的尘土被带走,它们中的大部分都会在大西洋中沉积下来,"

"通过对古代沉积物的研究,科学家发现,在过去的几十万年时间里,撒哈拉的气候一直在干燥和湿润之间有规律地切换,时间周期为2万多年."

"而在撒哈拉沙漠中发现的远古壁画,也从另一方面证实了这种现象,在这些壁画中出现了很多马\水牛\大象\长颈鹿等动物,而我们都知道,这些动物是不可能在沙漠中生存的,特别是马."

"大约距今4万年至2万年以前的时期里,撒哈拉地区还是一个湿润气候时期,那时候植物茂盛,河流纵横,湖泊成群,洪水经常泛滥."

"而到了距今2万年至1万年以前的时期里,这里气候变为干燥,植物变得稀少,河流断水成为干河谷."

"在这干燥期以后,气候又重变回湿润.至公元前3500年前后,雨量丰沛,草木繁茂,湖河充盈,水域面积达到最大."

"但那以后,烈风又重回这片大地,茂盛的森林变为草原,成为黄牛\绵羊\羚羊\长颈鹿的乐园,河马\水牛等动物绝迹,捕渔业也不复存在."

"公元前2000年以后,气候干燥程度加剧,草原动物也退出了舞台,河流断流,湖泊变小\干涸或消失,植被枯萎退化,由草原彻底变为沙漠,许多草原动物被迫退出撒哈拉的历史舞台."

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