It is due to breakdown of complex inorganic substances into simple organicsubstances

The process you are referring to is typically known as "mineralization" or "decomposition." In the context of environmental science and biogeochemical cycles, this term describes how complex inorganic substances, such as minerals or organic materials, are broken down into simpler inorganic or organic substances.

1. Decomposition Process: Microorganisms, including bacteria and fungi, play a crucial role in breaking down these complex substances. They convert complex organic materials such as dead plants and animal matter into simpler forms that can be used by other organisms.

2. Mineralization: This process specifically refers to the conversion of organic matter into inorganic matter, which can then be utilized by plants as nutrients.

3. Importance: The breakdown facilitates nutrient cycling in ecosystems, ensuring the availability of essential elements like carbon, nitrogen, and phosphorus for living organisms.

4. Applications: Understanding mineralization is essential in agriculture, soil science, and waste management, as it helps in maintaining soil health and fertility.

In summary, the breakdown of complex inorganic substances into simpler organic substances is a critical process in ecosystems that supports life by recycling nutrients and maintaining ecological balance.