Erratic block - it's moved far away from where it comes from, drainage basin - funnel shaped area where water is collected, gullies - a ravine formed by the action of water on soft rock, meander - When the rives has a smooth slope , rapids - They are quite frequent in the upper course, river pothole - They are produced by stones carried by water, glacial cirque - Upper part of a glaciar, Arete - it's situated between two glacial valleys, Delta - It's formed by a river when it ends in a quiet sea. , Alluvial fan - At the end of a torrent,

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