Question

which clastic sediment has the smallest grain size?
sand
clay
pebbles
gravel

Explanation:

Clastic sediments are classified by grain size. Pebbles and gravel are relatively large - sized. Sand has a grain size range of \( 0.0625 - 2\) mm. Clay has the smallest grain size, with particles less than \( 0.004\) mm in diameter.

Answer:

clay