Form compost is a process of breaking down organic matter into a nutrient-rich soil amendment. It involves the decomposition of organic material such as leaves, grass clippings, and food scraps. The process is accelerated by adding oxygen, moisture, and microorganisms. The end result is a dark, crumbly material that can be used to improve soil structure and fertility. The term 'form compost' is derived from the word 'ROT, ' which is the 3 letter solution to the crossword puzzle.