volcanic+tufa
51Death Valley National Park — IUCN Category II (National Park) …
52Orvieto — For the wine, see Orvieto (wine). Orvieto   Comune   Città di Orvieto …
53Mojave National Preserve — IUCN Category V (Protected Landscape/Seascape) …
54Mokelumne Wilderness — IUCN Category Ib (Wilderness Area) Mokelumne Wilderness …
55Mount Dana (Alaska) — Mount Dana Crater of Mount Dana Elevation 1,354 m (4,442 ft) …
56Mount Shasta Wilderness — IUCN Category Ib (Wilderness Area) Location …
57tuff — /tʌf/ (say tuf) noun a rock of volcanic origin, comprising compacted or cemented volcanic ash and dust. Also, volcanic tuff. {French tuf, from Italian tufo tufa} –tuffaceous /təˈfeɪʃəs/ (say tuh fayshuhs), adjective …
58Hot Springs National Park — Infobox protected area | name = Hot Springs National Park iucn category = II caption = locator x = 160 locator y = 120 location = Garland County, Arkansas, USA nearest city = Hot Springs lat degrees = 34 | lat minutes = 30 | lat seconds = 49 |… …
59TUFF — The technical term for the consolidated ash deposits of volcanic origin that make up much of the landscape of South Etruria. The Italian terms tufo or tufa are sometimes employed colloquially in English, but can be confused with the technical… …
60tuff — [tuf] n. [Fr tuf, earlier tufe, tuffe < It tufo, TUFA] a porous igneous rock, usually stratified, formed by consolidation of volcanic ash, dust, etc. tuffaceous [tufā′shəs] adj …
