Ключевые слова: biodiversity, conservation, dirt, earth, earth art, earth day, earth layers, earth science, earth sciences, earth textures, earth tones, ecology, ecosystem, environment, environmental awareness, environmental protection, environmentalism, geology, geology art, green, ground, landscape, layers, natural, natural resources, nature, nature art, nature conservation, nature preservation, organic, outdoors, planet, sediment, soil, soil conservation, soil layers, soil texture, strata, sustainability, terrain, texture,