living things are made up of materials they get from their surroundings.
Plants take elements like Carbon, Oxygen, Hydrogen and Nitrogen from the soil or the air. They turn these elements into complex compounds like Carbohydrates, fats and proteins that make up living organisms, these then pass through the food chain.
These elements are returend to the environment in waste products produced by orgainsms or when the orgainsms die.
The material decays becuase they are broken down (digested) by microrgainsms.
Microorganisms work best in moist, warm conditions. Most microorganism break down material faster when there's plenty of oxygen avilable. Compost bins create these conditions.
All these important elements are then recycled- return to the soil, ready to be used by new plants and put back into the food chain again.
The materials taken out of the soil and used are balanced by those that are put back in. There's a constant cycle happening.
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