I am crossed between B and D but I think the answer is D because the mountains are in a high altitude so it is tall enough to touch the skies and with that the winds hit the mountains. <span />
Moral altruism
they helped informed only by ethical consideration regardless of any rivalry between the teams. Moral altruism is the highest calling in altruism(helping others selflessly) the team did not consider that if they failed to provide shelter to the other team it would get some advantage over it.
The coriolis effect influences wind by deflecting its path to the right in the Northern Hemisphere. The sequence of the weather satellite images show that the actual wind direction is from the southwest.
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Geographic location is the best answer
A few major cities located on 38 degrees north latitude:
Niigata, Japan
Seoul, South Korea
Shijiazhuang, China
Taiyuan, China
İzmir, Turkey
Athens, Greece
Palermo, Italy
Lisbon, Portugal
Washington D.C., USA
St. Louis, Missouri, USA
Sacramento, USA