Which of the following is not considered a mechanism of natural ...

[eruditmonkey@yahoo.com]

Which of the following is not considered a mechanism of natural climate change?
 
  A) volcanic eruptions.
  B) solar variability.
  C) changes in Earth-Sun relationships.
  D) the burning of fossil fuels.
  E) movement of continents via plate tectonics.

Question 2

Describe the formation of ridges and troughs in the upper atmosphere and how they are connected with weather patterns.
 
  What will be an ideal response?

[KKcool]

Answer to Question 1

D

Answer to Question 2

High pressure ridges typically bend poleward, while low pressure troughs bend equatorward. The pattern of ridges and troughs in the upper-air wind flow is important in sustaining surface cyclonic and anticyclonic circulation. Along ridges, winds slow and converge, along troughs, winds accelerate and diverge. Divergence is important to cyclonic circulation at the surface, while divergence is important to anticyclonic circulation.