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Organic matter is made up of organic compounds, which are the remains of dead plants and animals. Theoretically, anything not made up of organic matter is inorganic. The distinction between what is inorganic and organic is heavily debated among scientist.
Topsoil is made of humus and mineral particles weathered from the soil's parent material.
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The core is made up of Iron and Nickel.
[1] Earthworms can make plants grow better, and possibly faster, by the improvements that they make to soil. They tunnel through soil, thereby opening up passageways for air, nutrients, and water. [2] They open up pore spaces for the passing of water, thereby improving waterholding and drainage in soil. [3] They eat and eliminate, thereby building up organic matter in soil. [4] They die and decay, thereby adding their body and body parts to the organic content of soil.