A niche in sandstone,such as that in Arizona's Canyon de Chelly,is indicative of which weathering process?

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A niche in sandstone, particularly in a desert environment like Arizona's Canyon de Chelly, is likely formed due to salt-crystal growth. This process occurs when water containing dissolved salts seeps into the rock and then evaporates, leaving the salt crystals behind. Over time, these crystals can grow and exert pressure on the surrounding rock, leading to the formation of niches and other erosional features. Exfoliation, carbonation, and frost wedging are also examples of weathering processes, but they typically do not result in the formation of niches in sandstone.

A Niche in Sandstone,such as That in Arizona's Canyon De