the desert under stormy skies in arches national park.

reavel arches desert barren dry hostile harsh vegetation unprotected arid precipitation cold deserts temperature desertification weathering erosion sandstorm dust storm sand dunes bedrock shade underground conserving water dormancy irrigation solar energy sunlight stormy skies national park evaporite layer salt bed formation arches spires balanced rocks sandstone fins eroded monoliths bed paradox basin colorado plateau mya evaporated debris uncompahgre uplift jurassic mya vast navajo windblown sediments entrada navajo sediments eroded exposures cretaceous mancos formation thrust layers rock domes evaporites anticlines uplift faulting displacement moab fault visitor tourism tourist deposit