Identify the primary types of fuels found in wildland areas.

The primary types of fuels found in wildland areas include grass, shrubs, and trees, as these materials are combustible and serve as the main components that can ignite and sustain wildfires. Grass provides a fast-burning fuel source, while shrubs and trees contribute to the intensity and duration of a fire. These organic materials are critical in the wildland fire behavior because they can catch fire easily and release energy upon combustion, which can then spread flames rapidly through the landscape.

In contrast, the other options include non-combustible materials such as sand, gravel, clay, metal, plastic, glass, water, and soil, which do not serve as fuel sources in the context of wildfires. Understanding the types of fuels that exist in wildland areas is essential for predicting fire behavior and implementing effective fire management practices.