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Author Question: The percentage (by mass) of the Sun that is Hydrogen is about: A) 91. B) 71. C) 27. D) 9. E) ... (Read 89 times)

anjilletteb

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on: Jul 27, 2018
The percentage (by mass) of the Sun that is Hydrogen is about:
 
  A) 91.
  B) 71.
  C) 27.
  D) 9.
  E) less than 1.

Question 2

What is the primary source of erosion on the Moon? Why does change there take so long?
 
  What will be an ideal response?


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ashely1112

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Reply #1 on: Jul 27, 2018
Answer to Question 1

B

Answer to Question 2

A constant fall of meteoroids from space pelts the Moon, pulverizing the surface with tiny craters. But really big impacts are rare, and these microscopic changes take a long time to show up as seen from Earth. Our erosive agents like wind, water, and ice can make much more dramatic changes in short periods of time, such as floods, sandstorms, glaciers, etc.


anjilletteb

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Reply #2 on: Jul 27, 2018
Thank you!


ashely1112

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Reply #3 on: Jul 27, 2018
Always glad to help...


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