How do you say “gravel” in Vietnamese?

Vietnamese words for “gravel”

• sỏiListennoun
  Hanoi [sɔj˧˩] · Saigon [ʂɔj˨˩˦]sỏi dipping

  pebble; gravel

  for “gravel” meaning: Small fragments of rock, used for laying on the beds of roads and railways, and as ballast.

• đá dămListennoun
  Hanoi [ʔɗaː˧˦ zam˧˧] · Saigon [ʔɗaː˦˥ jam˧˧]đá rising dăm level

  gravel

  for “gravel” meaning: Small fragments of rock, used for laying on the beds of roads and railways, and as ballast.