Which term describes wandering, straight-walled, canyon-like cavities in the tube metal?

The term that correctly describes wandering, straight-walled, canyon-like cavities in the tube metal is water tracking. This phenomenon typically occurs in areas where water or moisture can collect and remain in contact with metal surfaces, leading to the development of these specific cavities. Water tracking is often associated with specific conditions such as inadequate drainage or extended periods of moisture exposure, which facilitates the erosion of the metal. Recognizing this terminology is essential in maintenance and repair to prevent further damage to the affected components.

The other terms—corrosion pits, cracks, and fissures—address different types of damage to materials. Corrosion pits refer to localized areas of corrosion that can appear as small holes, while cracks are linear separations that can propagate through a material, and fissures are similar to cracks but often represent narrower and shallower openings. Understanding these distinctions can aid in accurately diagnosing and addressing issues related to metal degradation in various systems.