Why do we see essentially the same face of the Moon at all times? ...

[james]

Why do we see essentially the same face of the Moon at all times?
 
  A) because the other face points toward us only at new Moon, when we can't see the Moon
  B) because the Moon does not rotate
  C) because the Moon's rotational and orbital periods are equal
  D) because the Sun illuminates only one half at a time
  E) because the Moon has a nearly circular orbit around Earth

Question 2

Which of the following statements about Earth's troposphere is not generally true?
 
  A) It is the lowest layer of the atmosphere.
  B) It is the layer of the atmosphere in which convection plays the most important role.
  C) It is the layer of the atmosphere in which ozone absorbs dangerous ultraviolet light from the Sun.
  D) It is a layer of the atmosphere in which temperature declines with increasing altitude.

[C.mcnichol98]

Answer to Question 1

C

Answer to Question 2

C

[james]

Excellent

[bblaney]

Gracias!