One possible nasty present on a rock that undergoes frost wedging is a concentrated mixture of organic matter and bacteria. This mixture could get trapped in the cracks and crevices of the rock. As ice forms within these cracks, it can force the organic matter and bacteria deeper into the rock, potentially causing microbial growth and decay. This can result in unpleasant odors, slimy textures, and the release of toxic substances.
When a rock undergoes frost wedging, a common nasty present that can be found on it is lichen. Lichen is a composite organism consisting of a symbiotic association between fungi and algae. These organisms can grow on the surface of rocks and contribute to their weathering. Lichen produce acids that dissolve minerals in the rock, making it more susceptible to frost wedging. So, if you observe a rock that has undergone frost wedging, you may find lichen growing on its surface.
