Multiple FF Questions

[PjO]

I have a few (or a lot) of questions about the game, as I just beat it the first time, and I'm replaying it again, as well.

EDIT: Some of the questions have already been answered partially or fully- they have been deleted. Read the following posts for the original questions and their answers.

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Final Fantasy VII

Story-related

-At the end of the game, Sephiroth is destroyed, and so releases Aeris's spirit into the Lifestream, bringing her prayer for Holy to the planet to make it's decision, correct?
-Sephiroth never died before the end of the game; Cloud threw him into the Lifestream after he'd been stabbed, correct? But how did Sephiroth become imprisoned in what looked to be giant materia?

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Please, anyone, answer these questions. I'll mark them off as they get answered. Thank you.