Centres can be volcanic.Logical formLearned from37 sentences. Tuffs can be volcanic.Logical formLearned from37 sentences. A (crater lake) can be volcanic.Logical formLearned from37 sentences. (Lava flows) can be volcanic.Logical formLearned from37 sentences. Caves can be volcanic.Logical formLearned from36 sentences. Outcrops can be volcanic.Logical formLearned from36 sentences. Islets can be volcanic.Logical formLearned from36 sentences. A period can be constituted-of-or-filled-with volcanic activity.Logical formLearned from35 sentences. A mudflow can be volcanic.Logical formLearned from35 sentences. A cinder can be volcanic.Logical formLearned from35 sentences. Margins can be volcanic.Logical formLearned from34 sentences. Fragments can be volcanic.Logical formLearned from34 sentences. A basement can be volcanic.Logical formLearned from34 sentences. A risk can be volcanic.Logical formLearned from34 sentences. A hill can be volcanic.Logical formLearned from34 sentences.