The discovery of Eris ________. A) was surprising, since we ...

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The discovery of Eris ________.
 
  A) was surprising, since we thought we knew about all large objects in the solar system
  B) was not surprising, because other Kuiper belt objects approaching the size of Pluto had already been discovered
  C) was not surprising, because the existence of a massive Planet X had been predicted nearly a century ago
  D) was surprising, due to its backwards orbit around the Sun

Question 2

Why are plate tectonics not as important a factor on the Moon as they are on Earth?
 
  What will be an ideal response?

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Answer to Question 1

B

Answer to Question 2

The Moon no longer has a molten core, and as it chilled faster than did the larger Earth, the Moon has a thicker crust. The Earth's thin crust is constantly being broken by the conveyor belt of magma pushing upward through our mantle.

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Gracias!

[Dinolord]

Thanks for the timely response, appreciate it