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The day the Panama Canal opened – level 3
15-08-1914The first idea to dig a canal between the Atlantic and...
The day Mount St. Helens erupts – level 2
18-05-1980In March 1980, there were several small earthquakes near Mount St....
The day Mount St. Helens erupts – level 3
18-05-1980On March 15, 1980, several small earthquakes indicated that magma may...