Silicas can be porous.Logical formLearned from2 sentences. (Silica aerogel) may be applied for a purpose.Logical formLearned from2 sentences. A structure may pertain-to a silica.Logical formLearned from2 sentences. A (silica content slag) can be high.Logical formLearned from2 sentences. A decrease can be in silica.Logical formLearned from2 sentences. An increase can be in biogenic silica.Logical formLearned from2 sentences. Biogenic silica can be a phase.Logical formLearned from2 sentences. (Silica particles) may have (grain densities).Logical formLearned from2 sentences. A type of alteration may be composed of silica.Logical formLearned from2 sentences. Dissolved silica may undergo a (concentration profile).Logical formLearned from2 sentences. An increase can be in silica.Logical formLearned from2 sentences. An increase can be in dissolved silica.Logical formLearned from2 sentences. Biogenic silica may undergo an abundance.Logical formLearned from2 sentences. A content of biogenic silica may indicate a productivity.Logical formLearned from2 sentences. Concentration may be associated with intervals of (silica content).Logical formLearned from2 sentences.