Volcanic effects are usually temporary, ranging from volcanic haze lingering for a few days after small eruptions to global temperature changes for a few years from large eruptions injecting sulfuric acid into the stratosphere. However, prehistoric super eruptions may have occurred that were so large their climactic effects could appear permanent even if they only persisted 10-20 years.

12. Volcanic effects are temporary. They range from volcanic haze hanging around a volcano for a few days after an eruption to perturbations of the Earth's temperature for a few years because of injection of sulfuric acid aerosols into the stratosphere by big eruptions. Of course there have been prehistoric eruptions the size of which we've never experienced. One of these might have climactic effects that would seem permanent even if they only lasted 10-20 years

13. created by: Nenet Editor: Nenet Inspired by: Nenet Animation By: Nenet Crew: Nenet Special thanks to Nenet Resources: *http://en.wikipedia.org/wiki/Volcano *http://volcano.und.edu/vwdocs/frequent_questions/group10_new.html Nenet 8c