There's water in the rocks. When it rains water gets trapped between rocks and layers of rock.
Then a storm comes in, more water, water is flowing filling cracks, pooling wherever it can, lightning strikes, the water trapped in and around some of the rocks very quickly heats up, turns to steam, and kaboom, you now have moving rock.
Presumably lightning strike erosion is a lot of energy over a short time compared to wind or water erosion which is much less energy but over much longer periods?
Then a storm comes in, more water, water is flowing filling cracks, pooling wherever it can, lightning strikes, the water trapped in and around some of the rocks very quickly heats up, turns to steam, and kaboom, you now have moving rock.
Presumably lightning strike erosion is a lot of energy over a short time compared to wind or water erosion which is much less energy but over much longer periods?