Answer: lev
Explanation: The Latin root 'lev' means 'light' as in 'not heavy. ' You can see 'lev' as a root in words such as elevator, levitate, and elevation.
The immediate cause of World War I that made the aforementioned items come into play (alliances, imperialism, militarism, nationalism) was the assassination of Archduke Franz Ferdinand of Austria Hungary.
You can send it to the school
I think that it is the Atlantic but let me know if this is incorrect...