One of the main causes of slow surface evolution is the: A) ...

[KimWrice]

One of the main causes of slow surface evolution is the:
 
  A) depletion of ozone layer.
  B) erosion due to moving air and water.
  C) heat released from infalling matter.
  D) heavy bombardment in the early Solar System.

Question 2

Except Venus and Uranus, all the other planets:
 
  A) rotate in the counterclockwise direction as seen from the north.
  B) revolve around their moons with their equators almost perpendicular to their orbits as seen from the north.
  C) revolve around the Sun in the clockwise direction as seen from the north.
  D) rotate on their sides with their equators almost perpendicular to their orbits as seen from the north.

[flannelavenger]

Answer to Question 1

B

Answer to Question 2

A