What is the definition of residuum soil?

Residuum soil is defined as soil that has not moved from its original location. This type of soil develops in place from the weathering and decomposition of underlying bedrock or parent material. Over time, physical and chemical processes break down the rock, contributing to the formation of soil layers that retain properties similar to the material from which they originated.

In contrast, soil that is transported by water or other means, such as the options that involve movement, would not be classified as residuum because it has been displaced from its point of origin due to natural forces. Understanding the concept of residuum is important in soil science and geography, as it highlights the relationship between soil formation and the stability of the geological substrate. This is fundamental in managing land and understanding ecological dynamics in various environments.