Stake attention in this memory
An educational poster titled "Horizon Tanah" (Soil Horizon) is displayed on a wall, likely within the Museum Tanah in Bogor, Indonesia. The poster depicts a soil cross-section with four visual layers: "Organic: O" (thin, green plants, brown soil), "Surface: A" (dark brown, visible roots), "Subsoil: B" (lighter brown, pronounced roots), and "Bedrock: R" (dark, rough rock). Below the diagram, five soil layers are described in Indonesian: * **Lapisan O (Organik):** Humus-rich, high in decomposing organic material, distinct from surface leaf litter. * **Lapisan A (Tanah Atas):** Topsoil with significant biological activity from organisms like earthworms, arthropods, and bacteria, often interacting with plant roots. * **Lapisan B (Tanah Bawah):** Subsoil containing iron, aluminum, or organic material, a mineral layer. * **Lapisan C (Tanah Induk):** Low in organic material, found beneath A and B, minimally affected by soil formation, potentially containing unweathered rock and parent material. * **Lapisan R (Batu Induk):** Partially weathered bedrock, very dense, hard, and not easily excavated. At the bottom of the poster, contact information and institution names are visible: "ktc.musi.org.id," "muse.pertanian.go.id," "Museum Tanah dan Peranan," and "museumtanahpertanian."
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