A volcanic ash can be thick.Logical formLearned from8 sentences. Volcanic ash may clog (turboprop airplane engines).Logical formLearned from8 sentences. A lull can be in volcanic activity.Logical formLearned from8 sentences. A volcanic eruption can be sudden.Logical formLearned from8 sentences. A volcanic eruption may cause a disruption to aviation.Logical formLearned from8 sentences. Volcanic ash may disrupt flights.Logical formLearned from8 sentences. Levels can be constituted-of-or-filled-with volcanic ash.Logical formLearned from8 sentences. Volcanic ash can be from an eruption.Logical formLearned from8 sentences. An (ash cloud) can be from a volcanic eruption.Logical formLearned from8 sentences. A park can be volcanic.Logical formLearned from8 sentences. Clouds can be constituted-of-or-filled-with volcanic gases.Logical formLearned from8 sentences. An outpouring can be volcanic.Logical formLearned from8 sentences. Volcanic eruptions can be in a country.Logical formLearned from7 sentences. Volcanic eruption can be in a country.Logical formLearned from7 sentences. (Ash particles) can be volcanic.Logical formLearned from7 sentences.