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Find number abc

If 5bb3c - 1ca5a = 415b5 find number abc. Multiple solutions may exist.

Correct answers: 3

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Artificial granite

In 1923, Time magazine described a process using extreme heat and pressure that could make granite and jade artificially within a few hours at the geophysical laboratory of the Carnegie Institution of Washington, D.C. The raw ingredients of the minerals were heated in a small electric furnace to 2,500°F under a pressure gradually increased up to 200,000-psi. Extreme pressure could also inject water into rock resulting in a soft, gelatin-like condition..«[Ref: Time 24 Dec 1923]

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