The portion of a chemical mixture or compound which furnishes oxygen for burning a fuel or propellant, creating an oxide.

Ash and other materials found on other remains at a fire scene which have a tendency to settle on top of the other objects.

The result of nitric oxide combining with oxygen in the atmosphere. A major component of photochemical smog.

Climate that is characteristic of the interior of a land mass of continental size, marked by large annual diurnal and day-to-day ranges of temperature, low relative humidity and irregular precipitation.

Means "turn" left or right. Applies to aircraft in flight, usually on the drop run, and when given as a command to the pilot, implies expectation of prompt compliance.

A specially prepared stick or set of sticks of known dry weight continuously exposed to the weather and periodically weighed to determine changes in moisture content as an indication of moisture changes in wildland fuels.

Burning an area where brush has excluded forest reproduction to prepare the area for tree planting.

Measures taken by jurisdictional agencies to impose bans and standards of use on certain human activities that could lead to the cause of wildland fire. Restrictions may be applied to: smoking in designated areas; open flame; mechanical operations in high-risk areas; and off-road use.

An administrative action limiting or prohibiting access to a specific geographic or jurisdictional area for the purposes of reducing wildfire or the risk it poses to life, property, and/or resources. Example of use: "Pursuant to 36 C.F.R. 261.50 (a) and (b), it is hereby ordered that the prohibitions hereinafter set forth apply to the general forest area of the Ozark-St. Francis National Forests until further notice."

Single vehicle or aircraft and its associated personnel and material provided for the purpose of responding to and abating a fire or other emergency.