permafrost

ریشه

Derived from 'perma-' (permanent) and 'frost'. First used in the 1940s.

مثال

• The permafrost in Siberia is melting at an alarming rate.
• Many houses in Alaska are built on permafrost.
• Permafrost contains large amounts of carbon.

ترکیب‌های رایج

Thawing permafrost Permafrost melting Permafrost layer Permafrost soil