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Author Question: Which of the following is TRUE about Earth's atmosphere? A) It is denser at higher altitudes. B) ... (Read 101 times)

theo

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on: Jul 14, 2018
Which of the following is TRUE about Earth's atmosphere?
 
  A) It is denser at higher altitudes.
  B) It allows gamma rays and X-rays reach the surface.
  C) The ozonosphere and ionosphere shield the surface from harmful radiation.
  D) Variable gases are the dominant gases in the atmosphere.

Question 2

The top of Earth's atmosphere is approximately
 
  A) 3,200 km (1,988 mi) above Earth's surface. B) 2,000 km (1,243 mi) above Earth's surface.
  C) 480 km (300 mi) above Earth's surface. D) 1,000 km (621 mi) above Earth's surface


matt95

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Reply #1 on: Jul 14, 2018
Answer to Question 1

C

Answer to Question 2

C


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