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Soil により Mind Map: Soil

1. Layers of soil

1.1. Topsoil Subsoil BedRock

1.2. soil can be red sandy and rich

1.2.1. weathered rocks is sand silt and clay

1.2.1.1. soil is made of rocks small pieces of seashells

1.2.1.1.1. organic compounds that has come from the remains of organisms such as plants and animals and their waste products in the environment