Rivers like the Nile or Colorado which rise in moist regions and then flow through arid landscapes are called exotic streams. Option A
A stream that receives a large portion of its water from an area's drainage system; for instance, a stream that originates in a humid or well-weathered location but travels through a desert before reaching the sea. Consider the Nile.
Exotic streams are ones that start in a humid area and travel through a dry area. The Nile and Colorado Rivers fall within this description. The Nile River's source is located in a moist area. Ethiopian Mountains
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