What are part of the components of a ground fire?

The components of a ground fire are crucial for understanding how these types of fires behave and spread. The correct option includes several significant terms that describe various aspects of a ground fire.

The origin refers to the initial point where the fire starts. The head is the part of the fire that is spreading most rapidly, usually moving in the direction of the wind. The perimeter outlines the overall outer edge of the fire's reach. Flanks are the sides of the fire, which are generally less intense than the head but still play a vital role in the fire’s expansion. The inclusion of finger, heel, and spot fires indicates a comprehensive view of the fire's structure; fingers are elongated strips of fire that extend from the main body, the heel is the back side of the fire often cooler and less active, and spot fires are smaller, isolated fires that can ignite away from the main fire.

This thorough categorization captures the complexity of ground fires and reflects a sophisticated understanding of fire dynamics, which is essential for effective firefighting strategy and planning.