If you look at the sky tonight (in 2021) , you will see a star that is 400 light years away. In what year did the star release that light?

Its led to migrationits led to death 

There is a great difference between the windward and leeward side of a mountain. windward and leeward sides are opposites.

Aeolian processes,  pertain to  wind  activity in the study of  geology  and  weather  and specifically to the wind's ability to shape the surface of the  earth  (or other  planets). winds may  erode, transport, and deposit materials and are effective agents in regions with sparse  vegetation, a lack of soil moisture and a large supply of unconsolidated  sediments. although water is a much more powerful eroding force than wind, aeolian processes are important in arid environments such as  deserts