Multiple choice general knowledge science & technology

How do deposits of graphite form, typically?

  1. as deposits around submarine, hot spring vents

  2. by decomposition of humus and soil gases during intense, tropical weathering

  3. by regional metamorphism of organic-rich, black shales

  4. as hydrothermal vein deposits in limestone around a granitic batholith
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C Correct answer
Explanation

Graphite primarily forms through regional metamorphism of organic-rich sedimentary rocks, particularly black shales. The high temperatures and pressures of metamorphism transform the carbonaceous material into crystalline graphite. This is the most common geological process for graphite formation.

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