impacts of tectonic hazards

• Soil fertility-In indonesia volcanic soils allow 2 or 3 crops to be grown annually, and in both countries terraced farms are on stratovolcaines
• Volcanoes provide tourism oportunities, such as due to lava flows, on low magnitude eruptions.
• Smithsonian institute defines an active volcano as one that has erupted since the last glacial period, and a dormant one having not erupted in the past 10000 years, and an extinct volcano as one that is not expected to erupt.