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NDA 1 2025 GAT, question 104

Topic: Geography

Q104

Which one of the following is formed when volcanic ash is carried by running water and is deposited as a sedimentary layer ?

  1. (a) Basalt
  2. (b) Lapilli
  3. (c) Slate
  4. (d) TuffCorrect answer

Solution.

Answer: (d) Tuff

  1. Tuff is rock formed by the consolidation of volcanic ash.
  2. Ash may be redeposited by water before it becomes consolidated.
  3. Basalt forms from lava, lapilli are larger volcanic fragments, and slate forms by metamorphism of fine sedimentary rock.