[EdwardDiego]

I've been camping on a mountainside when a storm came over at night and rocky outcrops on the ridge above us were struck repeatedly by lightning.

In the morning, clear blue skies, and we climbed up to have a look. Was sadly not very dramatic, we were expecting chunks of rock blown off, but you could see that the sudden heat had created fresh fissures, and around what we thought was the ground zero of a strike, the surface of the rock had become friable for a few centimetres.

But water/ice is always going to be a dominant feature in rock wasting, those lightning cracks just give it easier ingress.