Most likely the East becuase its where the wind blows most at.
Wind carries heat, moisture, pollutants, and pollen to new areas. Many daily weather patterns depend on wind. A coastal region, for instance, undergoes changes in wind direction daily. The sun heats the land more quickly than the water.
All mass isn't all together in one area but is actually more spread out.
Answer:
No.for example the tunguska event in 1908.an asteroid entered the atmosphere,exploded and sent pieces flying down 3-6miles to the surface
I hope this helps