Waters may undergo pollution.Logical formLearned from55 sentences. Surface may undergo pollution.Logical formLearned from55 sentences. (Mining operations) may leave behind pollution.Logical formLearned from55 sentences. Pollution may occur.Logical formLearned from55 sentences. Reductions can be in (air pollution).Logical formLearned from54 sentences. Pollution may raise temperatures.Logical formLearned from54 sentences. A cause may pertain-to pollution.Logical formLearned from54 sentences. A level can be constituted-of-or-filled-with pollution.Logical formLearned from54 sentences. Waterways may undergo pollution.Logical formLearned from54 sentences. Pollution can be from ships.Logical formLearned from53 sentences. Pollution can be dangerous.Logical formLearned from53 sentences. Forms can be constituted-of-or-filled-with (air pollution).Logical formLearned from53 sentences. Pollution can be chronic.Logical formLearned from52 sentences. An (air pollution) can be regional.Logical formLearned from51 sentences. Pollution can be from industry.Logical formLearned from51 sentences.