permafrost

noun

Pronunciation: /ˈpɜːrməfrɒst/

Definition

A layer of soil or rock that remains at or below the freezing point of water for two or more consecutive years.

Examples

• Global warming is causing the permafrost in Siberia to melt, releasing trapped greenhouse gases.

• Engineers must use special foundations to prevent buildings from sinking as the permafrost thaws.

• Scientists study ancient bacteria preserved within the deep layers of Arctic permafrost.

Synonyms of permafrost

Words with a similar meaning to permafrost:

• frozen ground
• cryosphere

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