Social Science (087) — AI-generated practice question

Coal and metallic minerals like copper, tin, and zinc are formed by entirely different geological processes, which is why they occur in different rock types.

Coal is found in sedimentary rocks because it formed through the deposition, accumulation, and compression of plant material in horizontal strata over millions of years — a surface-level, layering process.

Metallic minerals are found in igneous and metamorphic rocks because they were formed when minerals in liquid/molten or gaseous forms were forced upward through cracks and crevices, cooling and solidifying to form veins and lodes.

Thus, coal reflects a sedimentary (depositional) origin, while metallic minerals reflect an igneous/metamorphic (heat and pressure-driven, upward-forcing) origin.

Source: Chapter 5 — Minerals and Energy Resources, Mode of Occurrence of Minerals

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• The examiner expects you to link rock type → formation process for both categories — that's the core of a 3-mark answer.
• Key terms to use: veins and lodes, molten/gaseous forms, deposition/accumulation, horizontal strata — these come directly from the textbook and earn marks.
• Don't just list which mineral is where; explain the process — that's what the question asks ("what does this tell us about the processes").
• Two distinct processes = roughly two points, plus a concluding contrast = 3-mark coverage.