- Humus layer: The topmost layer, rich in decomposed organic matter from plants and animals, which provides nutrients for plant growth.
- Topsoil: A loose, nutrient-rich layer containing organic matter, plant roots, earthworms, and microorganisms essential for supporting plant life.
- Subsoil: A more compact layer beneath the topsoil, composed of minerals, rock fragments, and some organic matter, where deeper plant roots extend.
- Weathered rock (Parent material): Consists of broken-down rock pieces that are in the process of becoming soil; it is the source material from which the upper soil layers develop.
- Bedrock: The solid, unweathered rock layer at the bottom that supports all the overlying soil layers; no plants or animals live in this layer.
Parent Tip: Review the logic above to help your child master the concept of soil layer worksheet.
