Employees may be exposed to (silica dust).Logical formLearned from3 sentences. Overexposure to crystalline silica may result in silicosis.Logical formLearned from3 sentences. Activities may produce (silica dust).Logical formLearned from3 sentences. Exposure can be to levels of silica.Logical formLearned from3 sentences. Rocks can be rich in silica.Logical formLearned from3 sentences. (Silica gel) may undergo a formation.Logical formLearned from3 sentences. Over-exposure can be to crystalline silica.Logical formLearned from3 sentences. A silica may be removed.Logical formLearned from3 sentences. Exposure to silica may increase a risk of (respiratory disease).Logical formLearned from3 sentences. A market can be for silica.Logical formLearned from3 sentences. A combo may be inclosed within a shell of silica.Logical formLearned from3 sentences. A shell can be constituted-of-or-filled-with silica.Logical formLearned from3 sentences. Silica may be extracted.Logical formLearned from3 sentences. Samples may contain a percent of silica.Logical formLearned from3 sentences. A percent can be constituted-of-or-filled-with silica.Logical formLearned from3 sentences.