“tufa cave”的意思、由来-百科全书

词条	tufa cave
释义	tufa cave geological formation umbrella-like canopy formed as a calcium-carbonate-saturated stream plunges over a cliff. As the water is aerated, carbon dioxide is released, causing the calcium carbonate to be deposited. Tufa caves may completely bridge a river, forming a natural tunnel. One of the largest such caves is Tonto Natural Bridge (Tonto National Monument) near Payson, Ariz.
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