Crust may spread on some sides of ridges.Logical formLearned from2 sentences. Ridges can be on walls.Logical formLearned from2 sentences. A lack may pertain-to ridges.Logical formLearned from2 sentences. A field of ridges can be a material.Logical formLearned from2 sentences. Some ridges may be seen in shadows.Logical formLearned from2 sentences. Ridges may be formed by wind.Logical formLearned from2 sentences. Ridges may be seen on floors of troughs.Logical formLearned from2 sentences. Ridges may stand_out in relief.Logical formLearned from2 sentences. Ridges may represent material.Logical formLearned from2 sentences. Floors may display a set of ridges.Logical formLearned from2 sentences. Evidence of (wind action) may be found in a form of some ridges.Logical formLearned from2 sentences. A term can be for ridges.Logical formLearned from2 sentences. Dunes may form ridges.Logical formLearned from2 sentences. Ridges can be reminiscent of a movement of material.Logical formLearned from2 sentences. Ridges can be oriented.Logical formLearned from2 sentences.