BirdloveHi Birdlove,
I don't want to be dodging your questions but I think they all can be answered in a much better way by you exploring the Mt. St. Helens section of VolcanoWorld. There you will find photos, diagrams, maps, and explanations that relate to all of your questions. Afterwards, if there are still some specific things that you would like to know more about, please don't hesitate to ask us again.
Sincerely,
Scott Rowland
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