Answer:
This is obviously a simile meaning that it becomes very large very quickly considernig riverweed is a very fast growing river inhabiting weed.
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I think the author uses a tone that is calm at times and frenzied depending on where in the story you mean.
btw u mean tone ;)
<span>Thomas Paine believed that their youth lent itself to vigor and unity.</span>
Love in America. Explain that the best you can, & you’ll have a outstanding score!