Please help i will mark brainliest!

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

What is the waterway that links the atlantic and pacific ocean

Which phrase best completes the diagram?