Statement (D) is false because the boundary of the stratosphere meets the mesosphere, not the ionosphere. The transition zone at the top of the stratosphere is called the stratopause. Beyond this boundary, the mesosphere begins, followed by the thermosphere and then the ionosphere. Therefore, the stratosphere is physically separated from the ionosphere by an entire atmospheric layer. ANSWER: (D) The boundary of the stratosphere meets the ionosphere.
Which of the following statements about the stratosphere is false? (A) This layer is largely free of clouds. (B) The amount of dust particles and water vapor is very low in this layer. (C) The stratosphere extends up to a height of 50 km. (D) The boundary of the stratosphere meets the ionosphere.
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