Koeppen based the boundaries between climate classes on changes ...

[geodog55]

Koeppen based the boundaries between climate classes on changes in
 
  A) type of vegetation.
  B) elevation.
  C) precipitation.
  D) land use by humans.

Question 2

The Koeppen classification system
 
  A) was developed in the latter part of the twentieth century.
  B) was revised substantially by Koeppen over a period of nearly 20 years.
  C) has two broad categories of climates.
  D) is not the most widely used such system.

[pikon]

Answer to Question 1

Answer: A

Answer to Question 2

Answer: B