Chapter 17

Volcanoes

Lava of  Mount Loa, largest active volcano in the world

      Hawaii is an island formed and shaped by volcanic activity.Similarly, Oregon also shaped by volcanic activity in the pacific rim in the past.The Cascade mountains have volcanic mountains such as Mt.Hood(oregon's),Mt. Jefferson, Three sisters,Mr.Mazama and New berry volcanoe.The above mentioned mountains are 5 sentinels where volcanic activity is possible to occur.However, there was no eruption or hazardous volcanic activity happened for centuries contrast to Hawaii where hazardous volcanic eruptions are active.Geological evidences say, cities Portland and Bend are built upon volcanoes similarly all the Hawaiian islands are  formed by million of years of volcanic activity.

Sources
http://www.ohs.org/exhibits/traveling-exhibits/150-million-years/oregons-volcanic-wonderland.cfm

Google Images.Youtube.