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 > soil science > soil > soil morphological features > permafrost
Fields of Study > soil science > soil morphology > soil morphological features > permafrost
Preferred Term:

hielo permanente

Definition:
Suelo congelado permanentemente; por lo general se refiere a una capa que se encuentra a cierta profundidad bajo la superficie del suelo. A cualquier capa que se encuentre sobre este y que se derrita en verano se le llama capa activa.
Concept Schemes:
https://lod.nal.usda.gov/nalt
NALT Core
Términos Genéricos:
características morfológicas del suelo
Términos Relacionados:
URI:
https://lod.nal.usda.gov/nalt/27783
Download this Concept:
RDF/XMLCreated 2006-01-19, last modified 2017-06-02
Exactly Matching Concepts: