Define the following terms:
1. Humification
2. Gleying
1. Humification is the process in which organic matter in soil decomposes into humus, a dark, organic material that is important for soil fertility and health. Humification is an important process in the formation of soil and is influenced by factors such as temperature, moisture, and microbial activity.
2. Gleying refers to a process in soil formation where waterlogged conditions result in the depletion of oxygen and the reduction of iron, causing the soil to become grey or blue-grey in color. Gleying typically occurs in poorly drained soils, wetlands, and areas with high water tables.