Concept:The resource that is not conservable is the one that is naturally abundant and does not require preservation from depletion.
Explanation:Conservable resources are those that can be exhausted and therefore need careful management, such as minerals, soil, and water.
Air, however, is classified as an inexhaustible natural resource because it exists in abundance and is not depleted by use.
Although air can be polluted, it does not get used up in the same way that mineral deposits, soil fertility, or water supplies do.
Hence, among the given options, air is the substance that is not conservable as a natural resource.
Answer:B. Air