1) yes. It’s basically gas that’s all ionized.
2) often, the center is.
3) same thing as our atmosphere—~78% nitrogen, 21% oxygen, 1% argon, and a small percentage of other stuff.
4) not usually, but two caveats—since it kind of follows the path of least resistance, it can go down, then back up, then down again before striking. Also, if it’s a cloud to cloud strike, it can look like its curved, because the sky is curved.
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