What is the main visual difference between the lunar maria and ...

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What is the main visual difference between the lunar maria and the rest of the lunar surface? What are the implications of this observation?
 
  What will be an ideal response?

Question 2

Newton showed that Kepler's laws are ________.
 
  A) seriously in error
  B) the key to proving that Earth orbits our Sun
  C) actually only three of seven distinct laws of planetary motion
  D) natural consequences of the law of universal gravitation

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Answer to Question 1

The lunar maria are generally smooth compared to the rest of the Moon. The difference in the amount of craters shows that the maria formed more recently than the rest of the lunar surface, at the end of the heavy bombardment phase of the solar system.

Answer to Question 2

D

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Thanks for the timely response, appreciate it

[kjohnson]

TYSM