Who wrote the book uncle tom's cabin, which highlighted the horrors of slavery life

How did europeans and the introduction of european goods and ideas change native life ?

What from the columbian exchange had perhaps the biggest impact on the world?

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