A country can be subject to volcanic activity.Logical formLearned from2 sentences. Volcanic eruptions can be in recorded history.Logical formLearned from2 sentences. Volcanic rock may undergo a formation.Logical formLearned from2 sentences. Atolls can be volcanic.Logical formLearned from2 sentences. A volcanic mountain can be famous.Logical formLearned from2 sentences. Perlite can be a volcanic rock.Logical formLearned from2 sentences. (Or lava flows) can be volcanic.Logical formLearned from2 sentences. A protolith can be volcanic.Logical formLearned from2 sentences. Volcanic activity may be started.Logical formLearned from2 sentences. A bulk of a volcanic eruption may occur at ghats.Logical formLearned from2 sentences. Volcanic activity may decrease.Logical formLearned from2 sentences. A volcanic pipe may contain diamonds.Logical formLearned from2 sentences. A volcanic pipe may be knowned as a primary source of diamonds.Logical formLearned from2 sentences. A magma can be in volcanic pipes.Logical formLearned from2 sentences. Volcanic pipes may be related to regions of continental crust.Logical formLearned from2 sentences.