All layers are incredibly important. If we didn't, we would die very quickly and life would be inhabitable. The radiation from the son would kill us. The heat from the sun would dry up water and kill crops leaving us with no food/water.
The circumference of that circle is about 27.02.
That is know as the Kuiper Belt.
Gamma rays, x-rays, ultraviolet, infrared, microwaves, radio waves
C. Europe has a coastal location and many navigable rivers.
This geography allows for easy trade and commerce through commercial ships and boats.
