Answer:
Mountains or other topography
Explanation:
This makes sure the air rises and cools in temperature, but because they cant hold that much of the water they form into clouds.
D, combination of all the them
I'm pretty sure it's railroads, because there's not that many highways in Siberia, the rivers would be frozen over, and there's not a ton of people in Siberia. I'm sorry if I'm wrong.
Your answer will be The purpose of the European Union was to promote greater social, economic harmony among the nations of Western Europe.
A because they tell by their texture.