Diatomaceous earth is a natural, soft sedimentary rock made from the fossilized remains of tiny aquatic organisms called diatoms. These organisms have a unique silica-based cell wall, which contributes to the powdery texture of diatomaceous earth when ground. It is commonly used in various applications, including gardening, pest control, and as a filtration aid. In gardening, diatomaceous earth can help control pests like ants and cockroaches without the use of harmful chemicals. It works by dehydrating insects that come into contact with it. Additionally, it can improve soil aeration and drainage, making it beneficial for plant growth.