The number of impact craters on the slopes of Tharsis volcanoes ...

[amal]

The number of impact craters on the slopes of Tharsis volcanoes suggests that they have been inactive
 
  A) since Mars formed 4.6 billion years ago
  B) for at least a billion years
  C) for at least tens of millions of years
  D) only for the last few hundred years

Question 2

Newton's 3rd Law of Motion states that
 
  A) action and reaction are equal and opposite
  B) force equals mass times acceleration
  C) an object moves at a constant velocity unless a force acts
  D) the force of gravity decreases with increasing distance

[scottmt]

Answer to Question 1

C

Answer to Question 2

A

[amal]

Thanks for the timely response, appreciate it

[xiazhe]

Excellent