Sulfur cycling is the natural process through which sulfur moves between the atmosphere, land, and living organisms. It begins when sulfur compounds, like sulfate, are absorbed by plants from the soil. Animals then consume these plants, incorporating sulfur into their bodies. When plants and animals die, their bodies decompose, releasing sulfur back into the soil as sulfide or sulfate. Microorganisms play a crucial role in this process, breaking down organic matter and facilitating the conversion of sulfur into different forms. This cycling helps maintain the balance of sulfur in ecosystems, which is essential for life.