Frozen Ground : Natural Disaster. Soil or rock in which part or all of the pore water is frozen. Perennially frozen ground is called permafrost. Ground that freezes and thaws annually is called seasonally frozen ground
C.B., V. Barros, T.F. Stocker, D. Qin, D.J. Dokken, K.L. Ebi, M.D. Mastrandrea, K.J. Mach, G.-K. Plattner, S.K. Allen, M. Tignor, and P.M. Midgley (Eds.), Annex II, Acronyms and Glossary of Terms (In Managing the Risks of Extreme Events and Disasters to Advance Climate Change Adaptation), Intergovernmental Panel on Climate Change (IPCC), IPCC Secretariat, World Meteorological Organization, Geneva, Switzerland 2012. https://www.ipcc.ch/pdf/special-reports/srex/SREX- Annex_Glossary.pdf, (ND Emr/ Extrm Heat - Amer) {969}