Which of the following rocks is organically formed?

JAMB Geography 2023 188 views
Source: JAMB · 2023

Which of the following rocks is organically formed?

  1. Gypsum
  2. Coal ✓
  3. Grit
  4. Shale
Explanation

Coal is an organic rock. It forms from plant remains that were buried and compressed over millions of years.

Shale is made of compacted clay and mud, which are mineral particles, so it is a mechanically formed rock, not an organic one.

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