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Question

Which of the following statements about Earth's atmosphere is wrong?
  1. The gaseous envelop of the earth that consists of a mixture of gases and water vapours is called atmosphere
  2. The lower level of the atmosphere up to about 7 miles is called troposphere
  3. The middle region of the atmosphere is called stratosphere
  4. The locus of the point in space where gravity is constant is called ionosphere

A
The gaseous envelop of the earth that consists of a mixture of gases and water vapours is called atmosphere
B
The lower level of the atmosphere up to about 7 miles is called troposphere
C
The middle region of the atmosphere is called stratosphere
D
The locus of the point in space where gravity is constant is called ionosphere
Solution
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The ionosphere is the ionized part of Earth's upper atmosphere, from about 60 km (37 mi) to 1,000 km (620 mi) altitude, a region that includes the thermosphere and parts of the mesosphere and exosphere.
The correct answer is D.

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