Ключевые слова: arid, badlands, canada, canyon, carving, clay, coal, colour, crack, desert, drought, dry, earth, environment, erode, erosion, formation, geography, geology, hill, iron, mars, martian, metals, mine, moon, oxide, poor, ravine, red, rock, rolling, sand, scenery, sediment, shale, slope, soil, terrain, valley, volcano, water, wind,