The Sumerians lived in Mesopotamia around 4000 BC. Mesopotamia or the Fertile Crescent was a region in the Middle East between the Tigris and Euphrates rivers, in the territory of modern Iraq, Iran and Syria.
While nearly all the archipelago is part of Alaska and is usually considered as being in the  Alaskan Bush , at the extreme western end, the small, geologically related Commander Islands belong to Russia.The islands, with their 57 volcanoes, are in the northern part of the Pacific Ring of Fire.Physiographically, they are a distinct section of the larger Pacific Border province, which in turn is part of the larger Pacific Mountain System physiographic division.hile nearly all the archipelago is part of Alaska and is usually considered as being in the  Alaskan Bush , at the extreme western end, the small, geologically related Commander Islands belong to Russia.
Typified by 1. Alaskaâs Aleutian Islands 2. Andes of western South America B. Aleutian-type mountain building 1. Where two ocean plates converge and one is subducted beneath the other 2. Volcanic island arcs result from the steady subduction of oceanic lithosphere a. Most are found in the Pacific b. Active island arcs include 1. Mariana arc 2. New Hebrides arc 3. Tonga arc 4. Aleutian arc c. Continued development can result in the formation of mountainous topography consisting of igneous and metamorphic rocks C. Andean-type mountain building 1. Mountain building along continental margins a.