Climate can affect a lot about you: Such as If you live in a humid (Hot and sticky) area would you wear a fur coat & live in an igloo? (I should hope not) Or If you lived in the North (Where it snows A LOT!) would you wear shorts & a sleeveless t-shirt or live in a a house without insulation? 
-Hope this helps!
        
             
        
        
        
The civil war allowed the world to see how unnecessary slavery was and pushed for the 13th amendment to abolish slavery and give blacks equality because it was tearing the country apart. 
        
             
        
        
        
We show that municipalities that are exogenously exposed to the Drug War experience a 40% decrease in export growth on the intensive margin. Large exporters suffer larger effects, along with exports of more complex, capital intensive, and skill intensive products. Finally, using firm level data, we provide evidence consistent with violence increasing marginal exporting costs.
        
             
        
        
        
Answer:
Speed of sound wave   v=νλ=2000×0.35=700 m/s
Distance   d=1.5 km=1500 m
Time   t=vd=7001500≈2 s