A volcanic ash may bring a fear of problems to some persons.Logical formLearned from2 sentences. A volcanic ash may arrive in a country.Logical formLearned from2 sentences. (Ash clouds) may be hurled into atmosphere by a volcanic eruption.Logical formLearned from2 sentences. Dangers may be posed by clouds of volcanic ash.Logical formLearned from2 sentences. A cloud may be caused by a volcanic eruption.Logical formLearned from2 sentences. (Ash cover) may be released from a volcanic eruption.Logical formLearned from2 sentences. Areas may be affected by volcanic ash.Logical formLearned from2 sentences. Level can be on volcanic activity.Logical formLearned from2 sentences. Volcanic activity can be in modern times.Logical formLearned from2 sentences. A volcanic eruption can be in a world-city.Logical formLearned from2 sentences. Shocks can be volcanic.Logical formLearned from2 sentences. Volcanic tremors may lead to fears of an eruption.Logical formLearned from2 sentences. A volcanic activity may slow.Logical formLearned from2 sentences. A volcanic mountain may stand at some meters.Logical formLearned from2 sentences. Prey can be to volcanic activity.Logical formLearned from2 sentences.