What type of fire is characterized by fast-moving flames and can spread quickly through grass and brush?

The fire characterized by fast-moving flames that can quickly spread through grass and brush is a surface fire. Surface fires typically burn the vegetation on the ground layer, including grasses, shrubs, and small trees. Their movement is influenced by factors such as wind and terrain, which can cause them to spread rapidly, especially in dry conditions.

In contrast, ground fires occur below the surface and consume roots and organic matter, making them less visible and slower. Crown fires, on the other hand, spread through the canopy of trees and can be intense, but they typically require a taller vegetation structure to occur. Flashover refers to a rapid transition where all combustible materials in a space ignite simultaneously, but it is not a type of fire that spreads through grass and brush like a surface fire does. Understanding these distinctions is crucial for effective firefighting strategies, particularly in wildland fire scenarios.