grand canyon in the behind a gnarly pine tree hanging on in rocky soil.

rock tree flower geology wall plant terrain landscape ruins mountain wilderness art autumn cliff formation nature valley badlands wadi grand canyon background gnarly pine hanging rocky soil leaning rim earth#39aph39#s geological history exposed colorado river tributaries cut channels layer plateau uplifted incision geologists hypothesis down-cutting retreat cliffs deepening inhabited native americans settlements caves pueblo pilgrimages • glen • gulch • coulee gorge ravine gully scenery