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Q: Which of the following is not an organic sedimentary rock?
  • A. Sandstone
  • B. Coal
  • C. Lignite
  • D. Shale
Correct Answer: Option A - Organic sedimentary rocks formed due to, the action of organisms. Examples include fossilferous, limestone and coal. Sandstone is a type of sedimetary rock. It form when grains of sand are compressed together over very long periods of time.
A. Organic sedimentary rocks formed due to, the action of organisms. Examples include fossilferous, limestone and coal. Sandstone is a type of sedimetary rock. It form when grains of sand are compressed together over very long periods of time.

Explanations:

Organic sedimentary rocks formed due to, the action of organisms. Examples include fossilferous, limestone and coal. Sandstone is a type of sedimetary rock. It form when grains of sand are compressed together over very long periods of time.