Answer:
C. Water Vapor
Explanation:
Water vapor is transparent, like most constituents of the atmosphere. It is less dense than most of the other constituents of air and triggers convection currents that can lead to clouds.
Answer=B
Fur was considered the black gold of the far north.
Russia had no secure border. Following <span>the devastation faced by Soviet Union in WWII, they wanted to push the border away from Kiev, from Moscow & Minsk
</span><span>The Yalta Agreement between FDR, Churchill & Stalin had laid out the spheres of influence that each of the Allied countries would have, and the satellite countries all fell under the Soviet sphere. </span>
