نتایج جستجو برای: mountains and valleys
تعداد نتایج: 16831168 فیلتر نتایج به سال:
A recent epidemic of malaria in the highlands of Bolivia and establishment of multiple Anopheles species mosquitoes in the highlands of Ecuador highlights the reemergence of malaria in the Andes Mountains in South America. Because malaria was endemic to many highland valleys at the beginning of the 20th century, this review outlines the 20th century history of malaria in the highlands of Ecuado...
Xinjiang serves as a hub for trans-Eurasian exchange. The hominids are supposed to be greatly influenced by the environment due fragile ecology and arid climate. As territory with most significant complex geomorphic units in Inner Asia, features diverse spectrum of forms, including mountains, basins, deserts, river valleys, oases. This paper presents systematic summary locations 127 Bronze Age ...
Is there anything interesting left in isometric embeddings after the problem had been solved by John Nash? We do not venture a definite answer, but we outline the boundary of our knowledge and indicate conjectural directions one may pursue further. Our presentation is by no means comprehensive. The terrain of isometric embeddings and the fields surrounding this terrain are vast and craggy with ...
A major obstacle in understanding the evolution of Cenozoic climate has been the lack of well dated terrestrial evidence from high-latitude, glaciated regions. Here, we report the discovery of exceptionally well preserved fossils of lacustrine and terrestrial organisms from the McMurdo Dry Valleys sector of the Transantarctic Mountains for which we have established a precise radiometric chronol...
Climatic changes associated with Pleistocene glacial cycles profoundly affected species distributions, patterns of interpopulation gene flow, and demography. In species restricted to montane habitats, ranges may expand and contract along an elevational gradients in response to environmental fluctuations and create high levels of genetic variation among populations on different mountains. The sa...
The Warner Pass map area is located 185 kilometres north of Vancouver on the northeastern margin of the Coast Mountains. It covers an area of 980 square kilometres within the Chilcotin Range, and is characterized by rugged mountains and glaciated U-shaped valleys; elevations vary from IS00 metres to over 3000 mctres, with a treeline at about 1800 metres. The sheet was mapped at a scale of 1:20 ...
the district of miyān kūh in the ardal town,chahār mahāl bakhtiari province, because of its high mountains, deep valleys and the fields among small mounts, being placed in the path of the was dering tribes has been the focus of the attention. the rigion has two different viewpoint. one part featuring the mounts chēhēl cheshme and gereh with the altitude of more than 3500 m., has cold winter and...
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