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superstition mountains, arizona, desert plants, volcanic landforms, igneous rock, erosion	superstition mountains, arizona, desert plants, volcanic landforms, igneous rock, erosion	superstition mountains, arizona, desert plants, volcanic landforms, igneous rock, erosion

smith spring, guadalupe mountains, oasis, sandstone spillway, groundwater, ferns	guadalupe mountains, texas, el capitan, capitan reef, permian limestone fossil reef	guadalupe mountains, texas, desert and scrub plants, permian limestone fossil reef

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rock weathering, lichens, ridge top exposed to strong wind and rain, coronado national forest	rock weathering, lichens, ridge top exposed to strong wind and rain, coronado national forest	rock weathering, lichens, ridge top exposed to strong wind and rain, coronado national forest

rock weathering, lichens, ridge top exposed to strong wind and rain, coronado national forest	rock weathering, lichens, ridge top exposed to strong wind and rain, coronado national forest	root wedging, weathering, layered sedimentary rock, guadalupe mountains

root wedging, weathering, layered sedimentary rock, guadalupe mountains	root wedging, weathering, layered sedimentary rock, guadalupe mountains	layered sedimentary rock, guadalupe mountains, permian limestone fossil reef

layered sedimentary rock, guadalupe mountains, permian limestone fossil reef	layered sedimentary rock, guadalupe mountains, permian limestone fossil reef	layered sedimentary rock, guadalupe mountains, permian limestone fossil reef

layered sedimentary rock, guadalupe mountains, permian limestone fossil reef	layered sedimentary rock, guadalupe mountains, permian limestone fossil reef	layered sedimentary rock, guadalupe mountains, permian limestone fossil reef

rock crevasse, weathering, coronado national forest	rock crevasse, weathering, coronado national forest	rock crevasse, weathering, coronado national forest