Twain's experience as a Captain would have given him knowledge of the river that most authors wouldn't have. Having traveled the river, Twain was able to describe the banks, the islands, and the beauty from experience. Almost like a painting. His writing and experience leads the reader to be able to envision themselves in Twain's setting. That's an author's true gift~ to take the reader to places they've never been.
World economy,World enviorment,The world AIDS crisis,and the world arms race
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Today we know that the atmosphere of our planet is composed of 78% nitrogen, 21% oxygen, and small amounts of argon, carbon dioxide, neon, hydrogen and methane, among other gases.
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Impact?
Explanation:
Well considering the way this is written i would say impact fits best