Pollution can be from a (gold mine).Logical formLearned from7 sentences. A (pollution problem) may pertain-to a nation.Logical formLearned from7 sentences. A solution can be to a (pollution problem).Logical formLearned from7 sentences. Pollution may travel.Logical formLearned from7 sentences. An expert can be on (air pollution).Logical formLearned from7 sentences. (Air pollution) may be generated by (power plants).Logical formLearned from7 sentences. Heavy metals can be from industrial pollution.Logical formLearned from7 sentences. A (mercury pollution) can be airborne.Logical formLearned from7 sentences. Investments can be in (pollution controls).Logical formLearned from7 sentences. (Air pollution measurements) can be daily.Logical formLearned from7 sentences. Pollution may be created.Logical formLearned from7 sentences. A person may get pollution.Logical formLearned from7 sentences. (Air pollution) can be from coal-burning (power plants).Logical formLearned from7 sentences. A drop can be in pollution.Logical formLearned from7 sentences. Pollution can be in an area.Logical formLearned from7 sentences.