Ridges can be mysterious.Logical formLearned from4 sentences. (Surface ridges) can be icy.Logical formLearned from4 sentences. Ridges can be (surface change).Logical formLearned from4 sentences. Ridges may surround an old town.Logical formLearned from4 sentences. High pressure may undergo a (building ridge).Logical formLearned from4 sentences. A ridge can be short.Logical formLearned from4 sentences. A ridge can be on a roof.Logical formLearned from4 sentences. A ridge can be fortified.Logical formLearned from4 sentences. Ridges may pertain-to highlands.Logical formLearned from4 sentences. A ridge can be bare.Logical formLearned from4 sentences. A map may show ridges.Logical formLearned from4 sentences. Ridges can be streamlined.Logical formLearned from4 sentences. Ridges can be aligned.Logical formLearned from4 sentences. Ridges can be on a (depression floor).Logical formLearned from4 sentences. Ridges can be dunes.Logical formLearned from4 sentences.