Any stream may lengthen its valley by ________ and delta ...

[ereecah]

Any stream may lengthen its valley by ________ and delta formation.
 
  A) headward erosion
  B) siltation
  C) saltation
  D) alluvial deposition
  E) delta erosion

Question 2

Death Valley is below sea level. Therefore, in Death Valley, base level is ________ ultimate base level.
 
  A) higher than
  B) lower than
  C) equal to
  D) not related to
  E) unchanging with respect to

[cuttiesgirl16]

Answer to Question 1

Answer: A

Answer to Question 2

Answer: B