A volcanic activity may decrease.Logical formLearned from4 sentences. A chaos may be caused by volcanic ash.Logical formLearned from4 sentences. Volcanic ash may come from a country.Logical formLearned from4 sentences. A volcanic ash may affect airspace.Logical formLearned from4 sentences. (Warning signs) may be caused to aircraft by volcanic ash.Logical formLearned from4 sentences. Volcanic ash may hit a coast of a country.Logical formLearned from4 sentences. (Air traffic) may be caused by volcanic ash.Logical formLearned from4 sentences. A volcanic ash may mushroom into a dark cloud.Logical formLearned from4 sentences. A volcanic ash may hang over a continent.Logical formLearned from4 sentences. A volcanic eruption may begin under a glacier.Logical formLearned from4 sentences. A volcanic ash may cloud skies.Logical formLearned from4 sentences. (Ash clouds) can be from a volcanic eruption.Logical formLearned from4 sentences. A civilisation may take a blow from a volcanic eruption.Logical formLearned from4 sentences. A male can be a volcanic island.Logical formLearned from4 sentences. Erruptions can be volcanic.Logical formLearned from4 sentences.