Soil is a complex and dynamic ______ composed of minerals, organic matter, water, air, and living organisms. It forms through the weathering of rocks and the ______ of organic materials over long periods. Soil serves as a vital ______ for plant growth and provides essential nutrients, water, and support for roots. Different types of soil are classified based on their ______ composition, texture, and structure. Soil plays a crucial role in ______ regulation, water filtration, nutrient cycling, and carbon storage. However, soil health is often threatened by ______ practices such as deforestation, agricultural intensification, urbanization, and pollution.
1) substance
2) decomposition
3) medium
4) chemical
5) ecosystem
6) human