Loess permafrost containing 50–90% ice and with organic matter amounting to about 2% carbon by mass. The permafrost is of Pleistocene age and covers more than 1 million km2 in Siberia. Yedoma is the name of a town in NE Siberia.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。