Describe the formation of alluvial fans and bajadas
What will be an ideal response?
In semiarid and arid areas, ephemeral streams exit constricted channels in mountains to flatter valleys. When the flowing water abruptly loses velocity as it leaves the constricted channel, it deposits sediment along the base of the mountain block, forming the alluvial fan. A continuous apron, called a bajada, may form if individual alluvial fans coalesce into one sloping surface.
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