<em>So not only are there the obvious intensity changes in ground solar radiation level during the day, going to zero at night, but the spectrum of the radiation changes through each day because of the changing absorption and scattering path length.</em>
<em>#</em><em>p</em><em>g</em><em>l</em><em>u</em><em>b</em><em>e</em><em>s</em><em>t</em><em>i</em><em>e</em><em>h</em><em>e</em><em>r</em><em>e</em>
Answer:
After the build up of anxiety from Nationalism, Imperialism and Militarism, the Powers were worried about being attacked by each other.To counter this alliances were formed. Germany made a mystery alliance with Austria-Hungary in 1879. The Alliance System was certainly a prominent reason of WWI.
Explanation:
