Question

In clastic sediments, the correct order of decreasing grain size is

• A. Boulder > pebble > silt > sand
• B. Granule > pebble > clay > silt
• C. Cobble > granule > silt > clay
• D. Granule > pebble > sand > silt

Hint:

When classifying clastic sediments, remember that granule and pebble are coarser than sand, and sand is coarser than silt.

Answer 1

The Correct Option is C

Step 1: Understanding grain size in clastic sediments.
In clastic sediments, the grain size is ranked from the largest to the smallest particles. The correct order of decreasing grain size typically starts with granules, followed by pebbles, then sand, and finally silt.

Step 2: Analyzing the options.
(A) Boulder > pebble > silt > sand: Incorrect, as sand is larger than silt.
(B) Granule > pebble > clay > silt: Incorrect, as clay is finer than silt.
(C) Cobble > granule > silt > clay: Incorrect, as silt is larger than clay.
(D) Granule > pebble > sand > silt: Correct — This is the correct order of grain size in clastic sediments.

Step 3: Conclusion.
The correct answer is (D) Granule > pebble > sand > silt, which is the proper order from largest to smallest grain size.