An official website of the United States government.

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

NAL Agricultural Thesaurus
U.S. Department of Agriculture

Concept Breadcrumbs

Fields of Study > geology > sediments > rock flour
Preferred Term:

rock flour

Definition:
Fine-grained, silt-size sediment formed by the mechanical erosion of bedrock at the base and sides of a glacier by moving ice. When it enters a stream, it turns the stream's color brown, gray, iridescent blue-green, or milky white. Also called glacier flour or glacier milk.
Concept Schemes:
NALT Full
Broader Concept:
sediments
Related Concepts:
Entry Terms:
  • glacier flour
  • glacier milk
  • glacial flour
URI:
https://lod.nal.usda.gov/nalt/233436
Download this Concept:
RDF/XMLCreated 2014-10-28, last modified 2014-11-20