2. When are volcanic eruption considered beneficial?
a. When they make surrounding area fertile
b. When they hasten the growth of microorganisms
C. When they build a new landform such as volcanic island
d. both a and b
Volcanic materials ultimately break down and weather to form some of the most fertile soils on Earth, cultivation of which has produced abundant food and fostered civilizations. The internal heat associated with young volcanic systems has been harnessed to produce geothermal energy.