What was the key industrial material that made the Second Industrial Revolution possible, and why?
A) Petroleum was key because most industries switched to it as their primary fuel, making coal obsolete.
B) Aluminum was essential due to its role in the production of heavier and stronger industrial machines and tools.
C) Rubber was the most valuable because it was found strictly in Europe and did not depend on transportation overseas.
D) Water was the most important resource, as it was often scarce and used for steam-powered machines and vehicles.
E) Steel, on account of its flexibility and strength, was the essential industrial material.
Correct Answer:
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