All of the above. A difference between a resource and a reserve is a. Resources include both materials that can be utilized economically today and those that are currently too expensive for use. Resources are smaller in quantity than reserves under most conditions. Reserve includes only those materials than can be currently utilized under present day economic conditions. Horizontal layer structure.
Residence time is the a. Average length of time that a chemical remains in a system.
Average length of time it takes for an unstable substance such as a pesticide to decompose by natural processes. Minimum amount of time that a substance stays in the environment. Maximum length of time that a chemical remains in a system. Sanitary landfills are generally utilized for disposal of a. Agricultural wastes. Acid mine wastes.