The earth during periods of high volcanic activity results in a significant increase in A: CO2.... (globalclimatescam.com)
Not all scientists are convinced that deep mantle plumes can propel tectonic plates, or are responsible for hot spots areas of unusually high volcanic activity such as the one under Réunion island. (livescience.com)
Areas with high volcanic activity also have some of the world's most fertile farmlands. (theconversation.com)