For 10 points, name this collection of organic materials and broken rock in which you might pot a plant.
This substance is divided by the USDA into orders such as mollisol and entisol. Created via pedogenesis, this substance has layers described by the sequence O-A-B-C-R that are called horizons. Greater-than-average amounts of humus (HYOO-muhs) are found in one type of it called loam. Its texture is determined by how much silt, sand, and clay it contains. For 10 points, name this collection of organic materials and broken rock in which you might pot a plant.
This substance is divided by the USDA into orders such as mollisol and entisol.
{soil} [or {earth}; or {dirt}]