At the beginning of this unit you agreed or disagreed with statements about volcanoes. Not all of the statements were true. Now that you have completed the unit, carefully think about each statement again then decide whether you agree or disagree with the statement based on what you have learned. How many of your responses changed?

1. Volcanoes are located primarily at tectonic plate boundaries. (Agree / Disagree)
   
   See "F1 - Formation of Volcanoes/Where are Volcanoes Found?" for more information.
2. The Hawaiian Islands were formed as the result of volcanic eruptions. (Agree / Disagree)
   
   See "F1 Ð Formation of Volcanoes/Volcanoes and Hot Spots - Activity: The Hawaiian Hot Spot" for more information.
3. The lava from all volcanoes has the same composition. (Agree / Disagree)
   
   There are two main types of lava: mafic lava and felsic lava. See "F2 - Types of Volcanoes" for more information.
4. All volcanic eruptions are violent and spectacular. (Agree / Disagree)
   
   The nature of an eruption is determined by the chemical and gas content of the lava. See "F2 - Types of Volcanoes" for more information.
5. Lava flows are the greatest hazard to humans during a volcanic eruption. (Agree / Disagree)
   
   Pyroclastic flows are generally considered to be the greatest hazard to humans during volcanic eruptions. See "F3 - Living with Volcanoes" for more information.
6. Volcanic soil is among the most fertile in the world. (Agree / Disagree)
   
   See "F3 - Living with Volcanoes/ Benefits of Volcanoes" for more information.
7. Scientists can now pinpoint the time of volcanic eruptions with a high degree of accuracy. (Agree / Disagree)
   
   Scientists can predict the general likelihood or probability of an eruption with some degree of success, but not the exact time and nature of an eruption. See "F3 - Living with Volcanoes/Predicting Volcanic Eruptions" for more information.