-- card: 45698 from stack: in
-- bmap block id: 0
-- flags: 4000
-- background id: 7720
-- name: #144
----- HyperTalk script -----
on openCard
  global group,rightone
  put 13 into group
  put "B" into rightone
  pass openCard
end openCard



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Question #13

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4BC-2.1 When the earth's atmosphere is struck by a meteor, a cylindrical region of free electrons is formed at what layer of the ionosphere?

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The F1 layer

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The E layer

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The F2 layer

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The D layer

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Correct answer is B