Soil - The thin top layer of the Earth where plants grow., Humus - Soft, dark soil made from dead plants and animals., Topsoil - The layer of soil below humus, made of clay and sand., Subsoil - The layer of soil under the topsoil that has pebbles and gravel., Bedrock - The hard rock layer deep under the soil., Clay - A thick, heavy soil that holds a lot of water., Sand - A light, fine soil that water passes through easily., Gravel - Small stones often found in soil, used to make roads and buildings., Plants - Living things that grow in soil and use roots to get food and water., Roots - The parts of a plant that grow underground and take in water and food.,

What is soil?

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