Summary
Highlights
The O Horizon is the uppermost layer where leaves and organic matter decompose, forming humus, which indicates the soil's fertility. Its thickness can vary.
The B Horizon, or subsoil, is hard and compact, requiring strong plant roots to reach it. This layer is rich in mineral deposits and clay.
Dr. Binocs shares a trivia fact about an additional layer, the E Horizon or eluviation layer, located between the A and B horizons.
Dr. Binocs and Mr. Mole introduce the topic of gardening and the importance of understanding the different layers of soil.
The Bedrock is the hardest layer, made of unweathered parent rock, supporting all the layers above it.
The C Horizon, also known as regolith, consists of weathered parent rock and lacks plant or organic matter.
The A Horizon, or topsoil, is rich in minerals and humus, making it ideal for planting seeds. It's soft and porous, allowing plant roots to grow easily, and is home to worms and rodents.