A valley is an elongated low area often running between hills or mountains, which will typically contain a river or stream running from one end to the other. Most valleys are formed by erosion of the land surface by rivers or streams over a very long period of time. Some valleys are formed through erosion by glacial ice. These glaciers may remain present in valleys in high mountain or polar areas. At lower latitudes and altitudes, these glacially formed valleys may have been created or enlarged during ice ages but now are ice-free and occupied by streams or rivers. In desert areas, valleys may be entirely dry or carry a watercourse only rarely. In areas of limestone bedrock, dry valleys may also result from drainage taking place underground rather than at the surface. Rift valleys arise principally from earth movements, rather than erosion. Many different types of valley are described by geographers, using terms that may be global in use or else applied only locally.
Answer:It was because the freedom riders challenged the non-enforcement of the U.S Supreme Court decisions that ruled that segregated public buses were unconstitutional.
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The pottery figures during the Tang dynasty are tomb figures. They are buried along with the dead. It was the belief that the tomb figures, in this case the Equestrian figures were representations of what would be used by the deceased in the next world.
