排序方式: 共有22条查询结果,搜索用时 15 毫秒
1.
巴尔干半岛(英Balkan Peninsula)是座很大的半岛,在欧洲各半岛中,按面积位居“老大”,它的南部又是欧洲古文明的发祥地,加之民族林立,所以自古以来,地区性名字很多,但在19世纪前的几千年间,本身却没有一个涵盖全境的统一名称。这种局面一直延续到19世纪初,稍后方有了些变化。 相似文献
2.
刚刚进入新千年没几年,古巴近海。当深海之下的水底结构被灯柱缓缓照亮时,呈现在人们视野里的,是方方正正的巨大石块儿和一些金字塔形状的建筑。担当这次任务的海面科考船通过声呐扫描后发现,这些白色巨石阵排列非常整齐, 相似文献
3.
4.
5.
6.
我在2005年曾撰文《湖南古人类何处觅》,就提到湘西北澧水流域石门、慈利、保靖一带的喀斯特溶洞最有可能找到湖南古人类化石。 相似文献
7.
东亚是一片古老而神秘的土地,诞育了为数众多的古代城市。在这些承载着东亚古文明的城市中,城市的中心往往与世俗政治权力中心高度重合,同属于儒家文化圈的中国长安和日本京都就是如此;而在另外一些古代城市,如柬埔寨的吴哥通王城,城市的中心则体现了世俗王权和宗教神权交织渗透的特点,而且宗教神权色彩更为突出。了解东亚文明,就从探索城... 相似文献
8.
失落的古文明一旦被发现,哪怕只是冰山一角,逝去的时代,掩盖了的真相,就像潮水一般不可遏制地重现在我们的眼前。抚仙湖水下古城的发现亦是如此,越来越多的迹象表明,这就是一个古代文明所遗留下来的大型建筑群。 相似文献
9.
10.
Abrupt Climate Change around 4 ka BP: Role of the Thermohaline Circulation as Indicated by a GCM Experiment 总被引:8,自引:1,他引:8
A great deal of palaeoenvironmental and palaeoclimatic evidence suggests that a predominant tem-perature drop and an aridification occurred at ca. 4.0 ka BP. Palaeoclimate studies in China support thisdedution. The collapse of ancient civilizations at ca. 4.0 ka BP in the Nile Valley and Mesopotamia hasbeen attributed to climate-induced aridification. A widespread alternation of the ancient cultures was alsofound in China at ca. 4.0 ka BP in concert with the collapse of the civilizations in the Old World. Palaeo-climatic studies indicate that the abrupt climate change at 4.0 ka BP is one of the realizations of the coldphase in millennial scale climate oscillations, which may be related to the modulation of the ThermohalineCirculation (THC) over the Atlantic Ocean. Therefore, this study conducts a numerical experiment ofa GCM with SST forcing to simulate the impact of the weakening of the THC. Results show a drop intemperature from North Europe, the northern middle East Asia, and northern East Asia and a significantreduction of precipitation in East Africa, the Middle East, the Indian Peninsula, and the Yellow RiverValley. This seems to support the idea that coldness and aridification at ca. 4.0 ka BP was caused by theweakening of the THC. 相似文献