Potential answers for "Layer of soil that never thaws"

⭐⭐⭐⭐ PERMAFROST
⭐⭐⭐ HARDPAN
⭐⭐⭐ LOAM
⭐⭐⭐ SOLUM
⭐⭐ MAIDEN
⭐⭐ OSOLEMIO
⭐⭐ EMU
⭐⭐ OZONE
⭐⭐ HISHELL

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