AUTHOR=Liu Weisheng , Shang Yunhu , Li Guoyu , Gao Kai , Zhang Hang , Sheng Jie TITLE=Seasonal freeze-thaw behavior of ground in mid-latitude cold regions: a case study in Bei’an County, Heilongjiang Province JOURNAL=Frontiers in Earth Science VOLUME=13 YEAR=2025 URL=https://www.frontiersin.org/journals/earth-science/articles/10.3389/feart.2025.1566593 DOI=10.3389/feart.2025.1566593 ISSN=2296-6463