Although the idea of had been developed in australia and ireland in the 1850s and instituted at the elmira reformatory in 1876, not until the mid-1920s did this practice become readily accepted and implemented throughout the united states

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