(Silica and/or reactions) may undergo a dissolution.Logical formLearned from2 sentences. A decrease can be in (silica concentration).Logical formLearned from2 sentences. Silica may increase downhole.Logical formLearned from2 sentences. A (silica belt) can be in holes.Logical formLearned from2 sentences. Cores may be recovered from a (silica belt).Logical formLearned from2 sentences. A silica may be supplied.Logical formLearned from2 sentences. (Mineral assemblages) may include amorphous silica.Logical formLearned from2 sentences. An increase can be in dissolved silica.Logical formLearned from2 sentences. Silica may undergo a leaching.Logical formLearned from2 sentences. A sink can be for dissolved silica.Logical formLearned from2 sentences. Sediments may be dominated by silica.Logical formLearned from2 sentences. An alteration may comprise (silica forms).Logical formLearned from2 sentences. Coatings can be constituted-of-or-filled-with silica.Logical formLearned from2 sentences. (Silica and/or reactions) may involve alteration of volcanic glass.Logical formLearned from2 sentences. A silica may be collated.Logical formLearned from2 sentences.