Frost boil

Frost boils (also known as mud boils, frost scars and mud circles) are upwellings of mud that occur through frost heave and cryoturbation in permafrost areas, such as arctic and alpine regions. They are typically 1 to 3 metres in diameter with a bare soil surface, and dominantly circular, lacking "a border of stones".

单词	Frost boil
释义	Frost boil 英语百科 Frost boil Frost boils (also known as mud boils, frost scars and mud circles) are upwellings of mud that occur through frost heave and cryoturbation in permafrost areas, such as arctic and alpine regions. They are typically 1 to 3 metres in diameter with a bare soil surface, and dominantly circular, lacking "a border of stones".
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