What is compost?

Compost refers to partially decomposed organic material that results from the controlled decomposition of various organic waste materials, such as food scraps, yard waste, and other biodegradable substances. This process typically involves aerobic microbes breaking down these materials over time, resulting in a nutrient-rich soil amendment that enhances soil structure, fertility, and microbial activity.

To elaborate on why this definition aligns with the correct answer, the term "compost" specifically describes a product that may still contain some recognizable organic material but has undergone a degree of decomposition that allows it to enrich soil effectively. It is commonly used in gardening and agriculture as a natural fertilizer, improving soil health by adding nutrients and aiding moisture retention.

The other options highlight different stages or types of organic materials. Completely decomposed organic material refers to finished compost, which is no longer considered compost but a final product that can be used in the garden. Fresh organic material may enhance soil but is not yet compost, as it hasn't gone through the decomposition process necessary to break it down. Organic material mixed with chemicals would not be considered compost; genuine compost consists solely of organic material.