soil - a mixture made up of broken-down rock and the decayed remmains of one living thing ., pollution  - anything is add to the enviroment and its harmful, humus - a nuitrient - rich soil that is  formed by the decayed of plants and animals, conservation - the protection of things found in nature, topsoil - the top layer of the soil, organic - related to living things or made from once-living thinngs,

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