Originally Posted by tmfpaer

I am befuddled and I could use some help. One of my students presented me with this theory and I need confirmation/debunking:

Here is the theory: High energy photons and particles bombard the atmosphere (true) which then start particle-antiparticle cascades (true). Some of the cascade particles then cause water-cloud nucleation sites (plausible?). As the Earth moves through different regions of cosmic ray flux (sure), the amount of cloud cover therefore varies.

What I said was not enough to debunk this for him and I might be wrong. I could use some expert help