Multiple choice

Which of the following types of rocks is an organically formed sedimentary rock?

  1. Gypsum

  2. Mudstone

  3. Limestone

  4. None of these

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Limestone is an organically formed sedimentary rock created from the accumulation of marine organism shells and skeletal fragments. Gypsum (A) is chemically precipitated, Mudstone (B) is clastic - both are not organically formed.