| A | B |
|---|
| controlled burn | prescribed burn |
| conventional crude | The viscous liquid drilled and pumped from underground oil deposits, or reserves. |
| conventional natural gas | Underground deposits of gases that are associated with crude oil deposits. Natural gas consists primarily of methane gas, |
| conventional nuclear fission | The process by which the nucleus of a heavy element (such as uranium-235 or plutonium-239) is split into lighter nuclei, resulting in the release of a large amount of heat. This heat is then used to power a turbine that generates electrical energy. |
| cord | A volume measure of stacked wood; 4 x 4 x 8 feet, or 128 cubic feet of wood and space |
| core sample | A small section removed from the trunk of a tree that allows foresters to determine the age of the tree (by looking at growth rings) without killing the tree |
| corridor | A track of land forming a passageway |
| covey | A small flock or group, often a family group of birds |
| creosote, wood-tar | Distillate oil derived from wood tar and produced as a by-product in the destructive distillation of either hardwoods or softwoods |
| crop tree | Any tree selected to grow to final harvest or to a selected size |
| crown | The top branches of a tree |
| crown-class | A tree classification system based on the tree’s relative height, foliage density, and ability to intercept light; measures past growth performance and calls attention to crop trees that could benefit from future thinning and harvest operations. |
| dominant trees | Larger-than-average trees with broad, well-developed crowns. These trees receive direct sunligh from all sides and above |
| codominant trees | Average-to-fairly large trees with medium-sized crowns that form the forest canopy. These trees receive full light from above, but are crowded on the sides. |
| intermediate trees | Medium-sized trees with small crowns below the general levl of the canopy. Intermediate trees receive little direct light, are poor crop trees, and should be removed during thinning operations. |
| suppressed | Small trees that grow below the tree canopy and receive no direct sunlight from any direction. |
| crown-sprout | The ability of some plants to regrow after plant material above ground is removed by fire or other disturbances |
| cruise | Measuring timber to determine the volume of a stand |
| cull | A tree or log of marketable size that is useless for all but firewood or pulpwood because of crookedness rot, injuries, or damage from disease or insects |
| cultivate | Tilling or working the soil for the purpose of growing crops and other desired plants. |
