A volcanic activity can be strong.Logical formLearned from3 sentences. The earth can be volcanic.Logical formLearned from3 sentences. An intensity of a volcanic activity may decline.Logical formLearned from2 sentences. A network may record some volcanic earthquakes.Logical formLearned from2 sentences. A volcanic eruption can be in a south country.Logical formLearned from2 sentences. Residents can be due to a volcanic eruption.Logical formLearned from2 sentences. A volcanic eruption can be on a month.Logical formLearned from2 sentences. An (ash cloud) may result from a volcanic eruption.Logical formLearned from2 sentences. An (air travel chaos) may occur after a volcanic eruption.Logical formLearned from2 sentences. (Ash cloud movements) can be volcanic.Logical formLearned from2 sentences. A (flight ban) may be caused by a volcanic ash.Logical formLearned from2 sentences. A change may bring volcanic ash from a country.Logical formLearned from2 sentences. A volcanic eruption may prevent flights.Logical formLearned from2 sentences. High density may pertain-to a volcanic ash.Logical formLearned from2 sentences. A volcanic eruption may lead to a shutdown of airspace.Logical formLearned from2 sentences.