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5444. Earth : The softer materials of the lithosphere, specifically called soil in agricultural science and soil science, as distinguished from firm rock. Its basic constituents are the products of rock disintegration, glaciation, and erosion, consisting of boulders, cobbles, pebbles, gravel, sand, silt, and clay, the latter in both particle and colloidal form. It also includes materials of organic, diatomaceous, or volcanic origin (e.g. peal limestone pumice). | ||