Detailed travertine rock formations on the underside of the Tonto Natural Bridge, Arizona
Keywords
geology,
travertine,
limestone,
calcium,
sedimentary,
rock,
percolation,
acid,
acidic,
precipitate,
precipitation,
calcite,
evaporation,
white,
grey,
weathered,
weathering,
arizona,
nature,
geologic,
outside,
reserve,
national park