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True continental crust did not form until the ________ Eon,when Earth had finally cooled enough for protocontinents to form.
Maginot Line
A line of defensive fortifications built by France along its border with Germany before World War II, intended to deter invasion.
Bunker-like Fortifications
Defensive military structures designed to protect against enemy attacks, resembling bunkers with reinforced walls and limited access points.
Belgian Frontier
The international border of Belgium with its neighboring countries, which has been a strategic and economic consideration throughout history.
Mersel-Kébir
A naval engagement off the coast of Algeria in 1940, where the British Royal Navy attacked French Navy ships to prevent them from potentially falling into German hands during World War II.
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