Some places on Earth are so far from ocean moisture sources
that by the time weather systems reach them, most of the moisture
they carry has already fallen. This effect is worsened if the
weather systems have to rise over mountains or plateaus to
reach these areas, because cloud systems typically lose moisture
as they rise over mountains. These remote areas therefore
have little chance of receiving significant rainfalls. The most
significant deserts in this category are the Taklimakan-Gobi
region of China, resting south of the Mongolian steppe on the
Alashan Plateau, and the Karakum of western Asia. The Gobi
is the world’s northernmost desert, and it is characterized by
1,000-foot (305-m) high sand dunes made of coarser-thannormal
sand and gravel, built up layer-by-layer by material
moved and deposited by the wind. It is a desolate region,
conquered successively by Genghis Khan, warriors of the
Ming Dynasty, then the People’s Army of China. The sands
are still littered with remains of many of these battles, such as
the abandoned city of Khara Khoto. In 1372 Ming Dynasty
warriors conquered this walled city by cutting off its water
supply consisting of the Black River, waiting, then massacring
any remaining people in the city.














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