China is composed of a vast variety of highly different landscapes, with mostly plateaus and mountains in the west, and lower lands on the east. As a result, principal rivers flow from west to east, including the Yangtze (central), the Huang He (central-east), and the Amur (northeast), and sometimes toward the south (including the Pearl River, Mekong River, and Brahmaputra), with most Chinese rivers emptying into the Pacific.
Most of China's arable lands lie along the two major rivers, the Yangtze and the Huang He, and each are the centers around which are founded China's major ancient civilizations.
In the east, along the shores of the Yellow Sea and the East China Sea are found extensive and densely populated alluvial plains; the shore of the South China Sea is more mountainous and southern China is dominated by hill country and lower mountain ranges.
To the west, the north has a great alluvial plain, and the south has a vast calcareous tableland traversed by hill ranges of moderate elevation, with the Himalayas, containing the highest point Mount Everest. The northwest also has high plateaus among more arid desert landscapes such as the Takla-Makan and the Gobi Desert, which has been expanding. Due to a prolonged drought and perhaps poor agricultural practices, dust storms have become usual in the spring in China. Dust blows all the way to southern China, Taiwan, and has even been measured on the West Coast of the United States.
During many dynasties, the southwestern border of China has been the high mountains and deep valleys of Yunnan, which separate modern China from Burma, Laos and Vietnam.
The climate of China varies greatly. The northern zone (within which lies Beijing) has a climate with winters of Arctic severity. The central zone (within which Shanghai is situated) has a generally temperate climate. The southern zone (within which lies Guangzhou and other southern provinces) has a generally subtropical climate.
The Palaeozoic formations of China, excepting only the upper part of the Carboniferous system, are marine, while the Mesozoic and Tertiary deposits are estuarine and freshwater or else of terrestrial origin. Groups of volcanic cones occur in the Great Plain of north China. In the Liaodong and Shandong Peninsulas, there are basaltic plateaux.
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The climate of China is extremely diverse; tropical in the south to subarctic in the north.
Monsoon winds, caused by differences in the heat-absorbing capacity of the continent and the ocean, dominate the climate. Alternating seasonal air-mass movements and accompanying winds are moist in summer and dry in winter. The advance and retreat of the monsoons account in large degree for the timing of the rainy season and the amount of rainfall throughout the country. Tremendous differences in latitude, longitude, and altitude give rise to sharp variations in precipitation and temperature within China. Although most of the country lies in the temperate belt, its climatic patterns are complex.
China's northernmost point lies along the Heilong Jiang in Heilongjiang Province in the cold-temperate zone; its southernmost point, Hainan Island, has a tropical climate. Temperature differences in winter are great, but in summer the diversity is considerably less. |
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For example, the northern portions of Heilongjiang Province experience an average January mean temperature of below 0°C, and the reading may drop to minus 30°C; the average July mean in the same area may exceed 20 °C. By contrast, the central and southern parts of Guangdong Province experience an average January temperature of above 10 °C, while the July mean is about 28 °C.
Precipitation varies regionally even more than temperature. China south of the Qinling mountains experiences abundant rainfall, most of it coming with the summer monsoons. To the north and west of the range, however, rainfall is uncertain. The farther north and west one moves, the scantier and more uncertain it becomes. The northwest has the lowest annual rainfall in the country and no precipitation at all in its desert areas.
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