Found these strange dirt-like veins running up my basement wall. They crumble when touched but seem hollow inside. Do I have a leak or something else?

where wood meets the ground or is in contact with soil, as these are prime entry points for termites.

Inspect wooden structures for blistering or warping, which can occur when termites tunnel close to the surface. Additionally, listen for faint clicking sounds coming from the walls, which may be the sound of termites chewing or communicating.

While mud tubes are a primary concern, moisture issues can mimic their appearance. Leaks can cause efflorescence, mold growth, or