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Why did river valleys most farming impact the lives of neolithic peoples?

How were the okanogan highlands formed? a. by subduction, which caused huge folds in earths surface b. as a result of retreating glaciers carving great valleys into the earth c. when molten rock from under the earth approached the surface d. when the collision of volcanic island chains and ocean rocks formed new earth

Name: nicoledate: 6/18/19jasmine's bookmark is 10 centimeters long. its area is 30 square centimeters.what is the perimeter of her bookmark? sh