The are where an oceanic plate descends into the upper mantle is called a subduction zone.
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<span>Geography The land between the Tigris and Euphrates rivers was. a good region for agriculture. Geography The environment of Mesopotamia presented several. challenges to the people who lived there. Geography Mesopotamians changed their environment to improve life.
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1. Crust
2. Mantle
3. Inner core
4. Outer core
