The porous "mull" variety, which is most commonly found in forests, is characterized by an alkaline 
The porous "mull" variety, which is most commonly found in forests, is characterized by an alkaline pH and an abundance of insects, earthworms, and bacteria. In contrast, the "mor" type is more acidic, is found in colder temperatures, and commonly contains fungi and arthropods. The "moder" kind is found in between these extremes, though at the AO horizon, soil is composed purely of this material. For 10 points, name this brown-to-black colored organic matter caused by the microbial decomposition of plants and animals.
The porous "mull" variety, which is most commonly found in forests, is characterized by an alkaline pH and an abundance of insects, earthworms, and bacteria.
{humus}