Yep, that's right. Or at least half right, I'm not sure what's positive and negative here, I'd have to look it up. I once spent a summer chasing thunderstorms, racing to get in front of them and set up some snazzy equipment to measure the electric fields between the clouds and the ground as the storms passed over us. I've seen high speed photography of lightning strikes, and what happens is that a small bolt from the cloud--called the leader--snakes down relatively slowly through the atmosphere to the ground, which creates an ionized channel in the air for the major bolt, of opposite polarity, to strike upwards from the ground to the cloud. Most lightning, fortunately, doesn't involve the ground, by far the majority of it is between charge separations in the clouds, a mechanism that is not well understood. I'm sure Darkbeaver would have something wrong to say about it. :smile:I've heard it said the visible lightning is the positive charge striking upward.
I'll tell you something else too: I didn't know what it was to be really frightened until I saw a ground strike less than 50 feet from where I was. We were in hilly country near the Alberta foothills and had all been carefully instructed to set up the equipment in low spots and stay in the truck not touching any metal surface while the storm went by. I was a few seconds slow getting back into the truck one time, and a bolt struck a nearby high spot... Yikes! I'd felt all the hairs on my body stand up and had dropped flat to the ground beside the truck as I'd been trained to do when that happens, before the strike, and was untouched, but it was as close as I ever want to be to a lightning bolt.
Not particularly relevant to a thread about atheist jokes, unless you take the view that god was shooting for me and missed...
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